Lab
Guiding Question: What are the factors that affect the appearance of impact craters? How do scientists use craters to tell the relative age of them
Hypothesis: I think that the weight and temperature will affect the appearance of the crater.
Materials:
Tray
Flour
Marbles
Ruler (cm/mm)
Computer.
Meter stick
Procedure
Mark 30, 60, 90, and 200 cm on a meter stick. Then, put the ruler vertically inside the tray full of flour. Then take your marble and drop it into the flour at 30 cm. Then repeat this process 3 times for 30cm drop. Record the diameter of the hole in flour the marble made and also how deep it is. After that repeat this process for the other drop heights.
Data Table
On next post
Conclusion
In this experiment I discovered that the higher drop height of the meteor the deeper hole it will create, however the diameter of the hole is not affected by this. I think that this is because a meter will burst on impact, while our marble won't. The deepness of the crater is affected by the speed of the marble and the speed of the marble is affected by the height it is dropped from.If the marble was dropped from an even higher place the crater would not increase in diameter, but will increase in depth until the point that the marble is so deep that the hole it makes will collapse on it.
Further Inquiry
I think that this experiment went relatively well and there aren't many ways to improve it, however I think that we should have tested even bigger heights to see if there is a difference, also I think that we could have measured the crater more accurately.
Hypothesis: I think that the weight and temperature will affect the appearance of the crater.
Materials:
Tray
Flour
Marbles
Ruler (cm/mm)
Computer.
Meter stick
Procedure
Mark 30, 60, 90, and 200 cm on a meter stick. Then, put the ruler vertically inside the tray full of flour. Then take your marble and drop it into the flour at 30 cm. Then repeat this process 3 times for 30cm drop. Record the diameter of the hole in flour the marble made and also how deep it is. After that repeat this process for the other drop heights.
Data Table
On next post
Conclusion
In this experiment I discovered that the higher drop height of the meteor the deeper hole it will create, however the diameter of the hole is not affected by this. I think that this is because a meter will burst on impact, while our marble won't. The deepness of the crater is affected by the speed of the marble and the speed of the marble is affected by the height it is dropped from.If the marble was dropped from an even higher place the crater would not increase in diameter, but will increase in depth until the point that the marble is so deep that the hole it makes will collapse on it.
Further Inquiry
I think that this experiment went relatively well and there aren't many ways to improve it, however I think that we should have tested even bigger heights to see if there is a difference, also I think that we could have measured the crater more accurately.
Current Events
Black Holes
On March 28 astronomers got the first glimpse of of a dormant black hole become live. Scientists think that the explosion of a couple stars caused it to restart. If this black hole sucks in a star, it could stay live for another 1000 years. If this happened to the dormant black hole in the Milky Way were to start Earth could be in danger. However that is highly unlikely.
The black hole is sucking in a large amount of gas and jetting it out again. If the black hole in the milky way started, that is also what it would do, except that the jet of gas it is expelling would be 40 times stronger than the jet of gas the other galaxies would be.
However, this is not actually the first time this has ever been caught on camera. This was done at 3 other occasions but Nasa's Swift satellite caught it minutes after it happened, while on other occasions they caught it days or weeks later. Maybe that is because they are so far away. This one in fact is 3.8 billion light years away.
On March 28 astronomers got the first glimpse of of a dormant black hole become live. Scientists think that the explosion of a couple stars caused it to restart. If this black hole sucks in a star, it could stay live for another 1000 years. If this happened to the dormant black hole in the Milky Way were to start Earth could be in danger. However that is highly unlikely.
The black hole is sucking in a large amount of gas and jetting it out again. If the black hole in the milky way started, that is also what it would do, except that the jet of gas it is expelling would be 40 times stronger than the jet of gas the other galaxies would be.
However, this is not actually the first time this has ever been caught on camera. This was done at 3 other occasions but Nasa's Swift satellite caught it minutes after it happened, while on other occasions they caught it days or weeks later. Maybe that is because they are so far away. This one in fact is 3.8 billion light years away.
Current Events
Moon Buggy
The Moon buggy is a 1 horsepower vehicle. No doors, no windows. Just some equipment and painful chairs. If anyone else made it it would probably cost 10 bucks. But it was made by Nasa, and it was for the Moon, so it cost 20 million US dollars, mind you, that was the day when an average car only cost 3000 or so. However, on the moon the moon buggy was very useful, expanding our knowledge of the moon. The only drawback was that because the moon buggy didn't have any extra supplies, the NASA team could only go to a distance where they could walk back from.
However, the new moon buggy has solved the problem. The new moon buggy costs 4.5 million dollars, looks like a truck with a round cabin, however it is a very high tech piece of equipment. On earth it weighs 4 tons but on the moon it weighs 760 kilos. Its top speed is about 16 kph. The moon has 12 wheels, and a motor for every other wheel. It has powerful computers that can make it navigate ditched and rocks. Mos importantly, it is sealed and has its own air and food supply, making it be able to travel much further much faster ans much safer. However, if you do get bogged down you can exit the buggy through a door that leads right into your space suit. No more hopping around trying to get it on. All you have to do is stretch you legs our in to the suit, put your arm through the top part and start walking. The space suit would be full of supplies that hopefully is enough to get you back. However breaking down is very unlikely.
Its tires are from a tractor, chosen for their toughness.. It can change its height off the ground for bumpy terrain. Its so good on hard terrain, that even on earth weighing 4 tons it can climb over 30 degree slopes. However, all this is useless since the moon missions have all been canceled. The 4.5 million dollar piece of modern machinery will just go to a warehouse for the rest of its life.
Moon Phases
I noticed that the parts of the moon change when the position it is to the sun changes, because before I always thought that part of the moon is blocked because there was a meteorite blocking it.We see different parts of the moon each nght because we can only see the moon when the sunlight is reflecting off it. So as the moon orbits the earth, the sunlight hits less or more of the moon, so we sometimes see a lot of the moon and sometimes we don't.
A lunar month is the amount of time from 1 full moon to the next.
Sun
1. The Southern Hemisphere gets the most concentrated light, and when its summer in the Northern hemisphere, the Northern hemisphere gets the most concentrated light.
2. Then the Southern hemisphere gets little or no light, so it winter there, while it is summer in the North.
3. There would be less heat because it would be more spread out and less concentrated since it shines over a bigger area.
4. The very middle of the North and South poles are the coldest because the sun almost never shines there, and if it does, only the very edge. While the equator is the hottest because it gets the full blast of the sun all year round.
5. When it is winter in the Northern hemisphere the toothpick shadow would be longest, while when it was summer in the Northern hemisphere the shadow would be shortest.
6. If the sun is directly above a square, it gets the most heat and light, while when its toward the south or north of the square, the heat and light received is less.
7. Seasons are cause when the sun is shining at different parts of the world far and close to a certain place. When the sun rays are shining closer to a certain place its spring then summer, but as it goes farther away is fall and winter.
Use your observations of an Earth-sun model to write an explanation of what causes the seasons.
2. Then the Southern hemisphere gets little or no light, so it winter there, while it is summer in the North.
3. There would be less heat because it would be more spread out and less concentrated since it shines over a bigger area.
4. The very middle of the North and South poles are the coldest because the sun almost never shines there, and if it does, only the very edge. While the equator is the hottest because it gets the full blast of the sun all year round.
5. When it is winter in the Northern hemisphere the toothpick shadow would be longest, while when it was summer in the Northern hemisphere the shadow would be shortest.
6. If the sun is directly above a square, it gets the most heat and light, while when its toward the south or north of the square, the heat and light received is less.
7. Seasons are cause when the sun is shining at different parts of the world far and close to a certain place. When the sun rays are shining closer to a certain place its spring then summer, but as it goes farther away is fall and winter.
Use your observations of an Earth-sun model to write an explanation of what causes the seasons.
Unit Reflection
The study of waves effect everyone. If no one studied waves there would be no internet, phones, RC toys. Planes wouldn't exist because they would have to fly close to the ground in order to navigate. Human kind would have never broken the sound barrier in flight, nobody would be sent to space. Without the study of waves humans kind would be reduced to living in small towns. Learning only what that small town knew and never going anywhere. Living on meat cooked on fire and surviving on the heat of fire in the winter. Making your own clothes. Everyone would be farmers of hunters.
Food Irradiation
In class we had a debate (2 people arguing for each opinion) about whether or not irradiated food was a good or bad thing. Tristan and I were were arguing for how it was good (pros), and Blaise and Julia were arguing to get rid of it (cons). In the end Cons won and our final conclusion was that:
The students of 7B from the International School of Belgrade propose that the labeling on irradiated products should also have a detailed description of the effects of radiation and the potential harm that could come across from it. Also, education awareness of the subject should be spread throughout the world of the dangers and possible long term effects of irradiated foods. We believe that there should be a choice for the customer whether they would like to experience this new discovery of the irradiated food.
The problem with food irradiation is that irradiating food uses radioactive technology which could be harmful, and along with getting rid of germs, it gets rid of some of the vitamins.
Pros and Cons of food irradiation:
Pros:
Food irradiation has stopped almost 76 million illnesses yearly. Before food irradiation was invented 25% of the food that was produced was spoiled or had food related illnesses on shelves or on their way to shelves. Without 25% of the food being spoiled, there is more food at cheaper prices.
Cons:
Irradiated food has 10% less nutrients then fresh food, and while irradiated food does have less food borne illnesses, it gains other ones that aren't necessarily and better. Also, even though it is FDA (Food and Drug Administration) approved, it still hasn't been tested on the long run.
If you gave me a choice from irradiated and fresh food, I would probably pick the fresh ones because they usually have more taste, and so my parents don't blame me for eating unhealthy.
My thinking didn't really change through the debate because I still don't really care if the food is irradiated or not. I think the debate was a good idea because it let me see other peoples point of view.
The students of 7B from the International School of Belgrade propose that the labeling on irradiated products should also have a detailed description of the effects of radiation and the potential harm that could come across from it. Also, education awareness of the subject should be spread throughout the world of the dangers and possible long term effects of irradiated foods. We believe that there should be a choice for the customer whether they would like to experience this new discovery of the irradiated food.
The problem with food irradiation is that irradiating food uses radioactive technology which could be harmful, and along with getting rid of germs, it gets rid of some of the vitamins.
Pros and Cons of food irradiation:
Pros:
Food irradiation has stopped almost 76 million illnesses yearly. Before food irradiation was invented 25% of the food that was produced was spoiled or had food related illnesses on shelves or on their way to shelves. Without 25% of the food being spoiled, there is more food at cheaper prices.
Cons:
Irradiated food has 10% less nutrients then fresh food, and while irradiated food does have less food borne illnesses, it gains other ones that aren't necessarily and better. Also, even though it is FDA (Food and Drug Administration) approved, it still hasn't been tested on the long run.
If you gave me a choice from irradiated and fresh food, I would probably pick the fresh ones because they usually have more taste, and so my parents don't blame me for eating unhealthy.
My thinking didn't really change through the debate because I still don't really care if the food is irradiated or not. I think the debate was a good idea because it let me see other peoples point of view.
Noise Pollution
Noise pollution is when there is a lot of noise (over 80 dB) in 1 area for a long period of time where someone is while not wearing anything covering their ears for a long period of time. This may sound like something from a from a sci-fi book but it still happens, in factories, target shooting, grenades/bombs, rockets, rock concerts, and wars. Noise pollution will be painful for you ears and it could cause hearing damage, and temporary or even permanent hearing loss.
Before, no one knew or cared about noise pollution, and as a result ex-soldiers who had been in a war over 10 years ago can be know to have bad hearing or if their unlucky, no hearing at all. Hearing damage is cause when a extremely loud sound (over 120 dB) is heard by a naked ear, which could damage or burst an eardrum, which is essential for hearing. Or it could damage hair cells, something that turns sound into electric signals that is then picked up and read by our brain and we hear the sound. But if these hair cells are damaged they will not grow back.
But now thanks to science and new technologies scientists are inventing new ways of stopping these problems. For 80 to 100 dB sounds you might as well just cover your ear or listen to some music with headphones. But for up to 110 to 130 and over you should have a Styrofoam earplug. This is very cheap but yet effective to keep workers ears from getting damaged and is found in almost every single factory where there might be loud sounds. Even if some aren’t used and are just there to get past health and safety.
For anything over that you should have headphones. And if it’s even higher than 190,(concussion grenade and some other types of bombs) scientists have invented a special ear plugs for the army that uses tiny filter that can deaden most sounds in a c war down to 22 dB. Scientists have also found out that there are sounds beyond a human’s ability to hear but yet some animals with sensitive hearing can hear it as a very annoying noise. Dogs are one of these species and trainers use special whistles which can emit this high pitched sound.
However, these inventions aren’t perfect. The cheap Styrofoam ear plug will be completely useless if there was a sound over 130 for a long period of time. Also the people who designed this small ear plug didn’t consider what workers who might do this for a living would be doing while wearing these ear plugs. Mainly, they would be moving around. But moving around is a big problem for these earplugs because the material they are made of is extremely squishy so it will mold to the basic shape of your ear, just slightly smaller, but once it’s in your ear it will not re-inflate so that while it’s in it is useful, but a small move will cause it to fall out onto the dirty ground. If this happens it will be dirty and its sticky surface will be dirty so you will get another. But sooner or later it will happen again, mostly sooner.
You could solve this problem by getting your company headphones, but if you have a lot of workers it won’t be cheap, and most will stick to the cheaper option. So there is something that often happens to humans, a perfect design ruined by the smallest thing.
Bibliography
Lab Report
Guiding question: How does the density of a material affect the properties of sound travelling from a tuning fork?
Hypothesis: We think that the more dense the medium, the lower pitch it will be.
Material:
Procedure:
Step 1: First of all you will need a partner to help you with the lab.
Step 2: When you have a partner, gather all of your materials that you will need to complete this test.
Step 3: After gathering all of your materials needed for the test start the lab.
Step 4: Bang the tuning fork on a table and then put it standing on it and put your head to hear the sound of it through the table, repeat this step with all the materials you chose to experiment with.
Record and Analyze:
Conclusion:
- Tuning fork (320E)
- Window
- Locker
- Table
- Aquarium
- Wall
Procedure:
Step 1: First of all you will need a partner to help you with the lab.
Step 2: When you have a partner, gather all of your materials that you will need to complete this test.
Step 3: After gathering all of your materials needed for the test start the lab.
Step 4: Bang the tuning fork on a table and then put it standing on it and put your head to hear the sound of it through the table, repeat this step with all the materials you chose to experiment with.
Record and Analyze:
| Medium | Density | Sound |
| Wall | .2 grams | Low pitch with no vibration |
| Table | .65 grams | Medium vibration with medium pitch |
| Aquarium | 2.5 grams | High pitch with no vibration |
| Window | 2.5 grams | High Pitch with lots of vibration |
| Locker | 3.9 grams | Medium vibration with high pitch |
Conclusion:
In this lab I learnt that the denser the object you put on the tuning for the higher pitch you will hear. This proves my hypothesis to be correct, which was: we think that the more dense the medium, the lower pitch it will be.
Further Inquiry:
If I were to do this experiment again I would see which sound lasts for longer and which one is loudest because in our experiment all we recorded was the pitch and vibrations. I also want to try the experiment with different tuning forks so that I would have a bigger variety of information. To this if I were to do this experiment again I would use more mediums.
Bibliography:
Current Events
Japan Earthquake
At 2:30 pm in Japan a 9.0 earthquake on the Richter scale set off a massive tsunami that hit the coast of Japan, completely flooding villages and damaging a nuclear power plant. The damage will cost the Japanese 25 billion dollars to repair and that is not even counting the damage to the nuclear power plant. The earthquake causes such a massive force that the earth was moves slightly in its orbit, and the day slowed down by microseconds. An estimate says that over 500 thousand Japanese citizens will be affected by this earthquake and the number may still grow if more help does not arrive soon enough. The damage has forced Japan to shut down electricity to prevent further damage. Help is arriving with more supplies but now the main problem was disease because of the dirty water. This is the biggest natural damage that has happened to Japan for over 100 years.
Japan is one of the most prepared countries in case of a tsunami, but this one completely caught them by surprise since no one expected something of this scale, and this was a large flaw in their tsunami warning system because the people were too at ease. This was also a large contributer to why so many building were swept away and so little resources are left. Another problem is their nuclear power plant, the meltdown Chernobyl consisted of one nuclear reactor, if Fukushima gets out of hand the meltdown will consist of 6 nuclear reactors. This is one of the biggest disasters in history.
Sound Lab
Guiding Question: How does the medium a sound travels through affect it?
Hypothesis: I think the thicker the band the lower the sound.
Materials:
Elastic bands
Partner
Procedure:
First get with you partner and get rubber bands of different shapes and sizes, then pull them while you partner plucks the string at different lengths and record what you heard. Then create a lab.
Data Analysis:
Thickness of rubber band:
Thick: a low, barley hear able pitch.
Thin: a higher and longer pitch.
Tightness of rubber band:
Loose: No sound at all
Tight: A low Slapping sound
Very tight: A high slapping and a long lasting vibration.
Length of rubber band:
Longest: A high slapping and a long lasting vibration.
Long:A low Slapping sound
Loose: No sound at all
Conclusion:
In this experiment I found out that the tighter and thinner the rubber band, the louder the sound and pitch will be when you pluck it, and it will vibrate for much longer. Rubber bands make sound through hitting each other or vibrating.
Further Inquiry:
If I were to do this experiment again I would try different kinds of rubber bands to see if that also affects the sound they make and how long they make it.
How People Produce Sound
Guiding Question: How do people produce sound
Hypothesis: I think people produce sound through their vocal cords changing shape and their lips and tongue moving around.
Materials
Partner
Voice
paper
pencil
Procedure
First you get with you partner and read the introduction, then you say words or letters to find out how your lips move. After that you record what you find out. Lastly you put what you found out into a lab.
Data analysis:
Different letters require different movements for the lips, breath, and vocal cords. For vowels you use your breath and vocal cords, for consonants you use your teeth, lips, and tongue. letters start with your mouth closed, and some with your mouth open. This way we can produce sounds with others can understand and therefore creating language. Other animals don't have such precise vocal cords and use body language to communicate.
Conclusion:
People have over the years managed to produce sound by changing their vocal cords. With vocal cords people have been able produce sounds much more accurate then other organisms. The only drawback with our improved vocal cords is that now we can't breath and drink at the same time. The vocal cords work by making sounds by emitting a sound and then when it goes through the vocal cords they stretch, widen, get smaller to change the sound. In this lab I have learnt the basics on how the vocal cords work and I have started to appreciate how complicated the human body is and how much harder it would be to have what we have today without vocal cords.
Further Inquiry:
If I were to do this lab again I would try to find out about how we have evolved our vocal cords over the centuries and I would also like to learn more about how vocal cords work and how life would be for us and animals without them
Earthquake Saftey
Since there aren't many earthquakes in Serbia and none of them very strong, I have never been taught on what to do in an earthquake situation. So based on the knowledge I gained in class this quarter, I would say that if Serbia was a place where strong earthquake happen, then for the safe spots in my house I would pick either for going under the dining room table because its one of the strongest tables in my house and I think it could stand the roof caving in because its very light. The only other place I would hide is the balcony because it is very strong since its made of cement and there are 2 metal structural beams running along the side. Also because there would be nothing to fall on me and very little danger of me falling off because there are walls an all four sides.
If I were to make a safety kit in case of an earthquake and I was stuck in(though I doubt it since the roof is aluminium and plaster) I would keep these things: first aid kit, sleeping bag, spare clothes, flashlight, batteries, canned food, water, small chainsaw, hammer, and tissues. If I'm going to be stuck in a hole for any amount of time, I would bring a PSP, and a android phone to call for help and to watch some videos.
Tsunami Warning Systems
Tsunami is a natural disaster that happens all over the world in oceans and seas. Tsunamis are caused by earthquakes, underwater volcano eruptions, underwater landslides, and huge icebergs breaking off from glaciers. A big tsunami can flood coastal villages, causing the water to become undrinkable, people to be stranded on rooftops, supplies non-existent, trees uprooted, houses smashed. Here are a few things you should know about tsunamis, it is the Japanese word for harbor waves. They can travel up to 450 miles per hour and can get up to 100 ft high. About 80% of all tsunamis happen in the Ring of Fire in the Pacific Ocean. At top speed a tsunami can cross the entire Pacific in one day. Away from land tsunamis are only a foot high and look the same like any other wave, but in a tsunami the top part of the wave travels faster than the bottom, causing it to grow higher. If you are on a beach and you see the water being sucked into the ocean a tsunami is coming and quickly warn others and go to higher ground. This is how a little girl saved hundreds of people that would listen to her, and got in the news. But don’t be the religious family of four, who got in the news by watching the water get sucked away and followed it until they were crushed by tons and tons of water. A tsunami is made of many waves, so if the first one hits there could be more to come, and most importantly, NEVER PANIC.
The most practical and most used way to survive a tsunami is to flee to higher ground, and to do this the people have to be prepared, which is why scientists have had to invent a special alarm that starts sounding a siren when it detects a tsunami approaching because before tsunami’s reach land they are just as high as a normal wave so people in boats can’t tell the difference, and only show themselves when they near shore and the water is shallower, when it is already too late for the people still there.
Some warning systems work by using a seismograph to record an earthquake, then it would send the data for the earthquake to officials if there is enough force to cause a tsunami. Then the officials decide whether to sound an alarm or not, but with this system there are many false alarms because sometimes even if there is a big earthquake there might not be a tsunami or the waves could go in the other direction. This system was also repeatedly unable to detect a tsunami which was why the people in Hawaii had no warning when a tsunami came to land and this cause devastation in 1946 and 1960. This caused scientists to try and develop a more reliable tsunami detector so when the next tsunami comes people will be ready for it. Another way people were able to have warnings for a tsunami was from watching animals. In 2004 when India was hit by a tsunami all the elephants ran to higher land due to their more sensitive hearing ability. Another way scientists have been able to tell when there is going to be a tsunami is by putting sensors on the ocean floor which will detect if there is a wave moving too fast or having too much energy. If it detects an alarm will be sent to officials who will decide whether it’s a false alarm or not. These sensors can go to 7000 meters under water and is self sustainable for up to 4 years, so it won’t be too expensive and it won’t cause too much environmental damage.
In 2004 the biggest earthquake in 40 years had just happened in the Indian ocean, the people at the Indian Meteorological Department recorded the earthquake and sent a warning by fax but the warning was not issued until after the tsunami hit the Indian coast. This tsunami cause 230,000 deaths and according to newspapers could have been avoided if the alarm had been issued on time. This is why now scientists and governments are trying to get enough finding to install reliable tsunami systems in poorer countries to prevent what happened in 2004 from repeating. I think that if there were more tsunami warning systems tsunami’s would no longer pose as such a threat to people in countries on the coast, this way it could save thousands of lives.
Lab Report
Guiding Question: Does a seismograph work better with string or wire?
Hypothesis: I think that the seismograph will work better with string because it will be more flexible and it will be easier for it to move left and right under movement.
Materials
· Flat piece of wood
· 2 on foot long pieces of wood
· Thin but long nails
· Hammer
· Saw
· Tape
· Paper
· Wire and string
· Scissors
· Marker
· Circular weights
Procedure
1. We took a foot long piece of wood and hammered 2 nails to stick it onto the side of the wooden board.
2. We took the other piece of wood and put it horizontally on the other 1 foot long piece of wood facing inwards.
3. We attached one long piece of wire or string to the top and side, leaving to the ends dangling.
4. We attach the wires or string to a 5 sq in flat piece of tape as to stabilize the markers movement.
5. We cut holes in the tape so we can put in the marker and attach the wire.
6. We add the weights to the tape.
7. We put pare under the marker and start shaking the board while pulling the paper from under the marker.
Data Analysis
In this lab I found out that the stronger the material and the more weights you put on it the more accurately it will be able to record earthquakes and the less likely that there will be a false alarm. I also found out that in a seismograph the marker isn’t suppose to move so that most of us where doing it the wrong way, but we still got some good results.
Conclusion
In this lab I found out about how seismographs are made and used. I learnt about earthquakes and how their recorded, why their recorded, and how the things that have been recorded are read. On the way I also learnt how to hammer a nail properly and always trust Aleksej’s random ideas. My hypothesis was incorrect and it turns our that’s a seismograph is better if it is more rigid and not flexible.
Further Inquiry
If I were to do this lab again I think I would try more weight to see if that would help and I would see that if the flat piece of tape we stuck the marker through would be better if it was bigger. Lastly I would try to stabilize the part of the seismograph where the 2 pieces of wood was stuck to the board because that cause the marker to life from the paper.
Lab Report
Guiding Question: How does the medium change the speed of the wave?
Hypothesis: I think the denser the liquid the slower the wave.
Materials:
Procedure:
Data Analysis:
Conclusion:
Through this experiment I found that the denser the liquid is, the smaller the wavelength and slower the wave. I support this because with water, the lest dense liquid, the average speed was around 8.5 cm/s and the average wavelength was around 2.8 cm. In the sweet water, which was the 2 densest liquid the average speed of 5.5 cm/s and a wavelength around 1.8 cm. For the sunflower oil, the densest liquid, its average speed was 4 cm/s and wavelength 1.25 cm.
Further Inquiry:
If I was to do this experiment again I would use more mediums and include things like ropes. This way I could see the difference between mediums much better and this way I might be able to prove myself wrong and that's good because in the process I would learn more while making a bit of a mess.
Hypothesis: I think the denser the liquid the slower the wave.
Materials:
- Water
- Sunflower Oil
- Sugar
- Tub
- Timer
- Recording System
- Help From a Friend
- A half and inch diameter tapping tool
- Ruler
- Tape
Procedure:
- Take your tub and tape you ruler onto the bottom, putting the 1 on the cm side facing you.
- Fill you tub with about 3 quarters full with water.
- Set your timer for 10 seconds.
- Ask you friend to count the wavelength.
- Start tapping the water with your tapping too and count the frequency.
- When 10 seconds are up record the wavelength and frequency and then find out the speed and record that too.
- Do 3 tests before switching mediums.
- Put sugar in until the water is sticky.
- Repeat the steps 3 to 7.
- Then dump the water and pour in the sunflower oil.
- Do the steps from 3 to 7 again.
- Your experiment is done.
Data Analysis:
| Water | Sweet water | Sun flower oil | |||||||
| Trial | Hz | Wave length | Speed | Hz | Wave length | Speed | Hz | Wave length | Speed |
| 1 | 3 Hz | 2.5 cm | 7.5 cms | 3 Hz | 2 cm | 6 cms | 3 Hz | 1 cm | 3 cms |
| 2 | 3 Hz | 3 cm | 9 cms | 3 Hz | 1.8 cm | 5.4 cms | 3 Hz | 2 cm | 6 cms |
| 3 | 3 Hz | 3.2 cm | 9.6 cms | 3 Hz | 1.7 cm | 5.1 cms | 3 Hz | .75 cm | 2.25 cms |
Conclusion:
Through this experiment I found that the denser the liquid is, the smaller the wavelength and slower the wave. I support this because with water, the lest dense liquid, the average speed was around 8.5 cm/s and the average wavelength was around 2.8 cm. In the sweet water, which was the 2 densest liquid the average speed of 5.5 cm/s and a wavelength around 1.8 cm. For the sunflower oil, the densest liquid, its average speed was 4 cm/s and wavelength 1.25 cm.
Further Inquiry:
If I was to do this experiment again I would use more mediums and include things like ropes. This way I could see the difference between mediums much better and this way I might be able to prove myself wrong and that's good because in the process I would learn more while making a bit of a mess.
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