Crave the Wave B
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Crave the Wave B
Carmel HS (IN) '16
Purdue BioE '21? reevaluating my life choices
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"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
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Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
About me || Rate my tests!
Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.
MY CABBAGES!
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Re: Crave the Wave B
The Question Marathon for Crave the Wave has begun!
1. Compressions and rarefactions are characteristic of what type of waves?
2. Explain how the Doppler Effect can be used to show that the universe is expanding.
3. Describe how noise-cancelling headphones work.
4. How many kilometers are in one lightyear? Express your answer in scientific notation and show your work.
1. Compressions and rarefactions are characteristic of what type of waves?
2. Explain how the Doppler Effect can be used to show that the universe is expanding.
3. Describe how noise-cancelling headphones work.
4. How many kilometers are in one lightyear? Express your answer in scientific notation and show your work.
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Re: Crave the Wave B
Longitudinal Waves
If a star is moving towards Earth, then it appears to emit light that is shorter in wavelength compared to a source of light that isn’t moving. Because shorter wavelengths correspond to a shift towards the blue end of the spectrum, this is called blueshift. In contrast, the light from a star moving away from us seems to shift towards longer wavelengths. As this is towards the red end of the spectrum, this is called redshift. So if the wavelengths from a source of light are longer, then we know that the universe is expanding.
A microphone "listens" to the outside sounds, and a small amplifier generates sound waves that are exactly out of phase with the outside sounds. The opposite sound waves collide and are cancelled. This is a phenomena called "destructive interference".
Using the definition of a light year, we calculate that it is (299,792,458 m/s)(365.25 days/year)(24 hours/day)(60 minutes/hour)(60 seconds/minute) = 9460730472580800 meters = 94607304725808 km = 9.4607304725808 x 10^12 km.
Problem 6. Order the following electromagnetic waves based on wavelength (longest to shortest): Gamma rays, infrared, microwaves, x-rays, radio waves, and ultraviolet.
Problem 7. Alex has a rope and wants to flick it so that it creates a wave. What are two things that he can do to increase how high the wave is?
Last edited by AlexWin0806 on October 11th, 2021, 5:56 pm, edited 1 time in total.
2019-2020: Training Team -- Density Lab, Disease Detectives, Dynamic Planet, Circuit Lab
2020-2021: Competition Team -- Dynamic Planet, Experimental Design
2021-2022: N/A -- Crave the Wave, Disease Detectives, Dynamic Planet, Experimental Design
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2020-2021: Competition Team -- Dynamic Planet, Experimental Design
2021-2022: N/A -- Crave the Wave, Disease Detectives, Dynamic Planet, Experimental Design
Don't open this link
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Re: Crave the Wave B
All correct!
8. When describing a wave using mathematical notation in a single point of time, it is common to use the form y = a sin (bx-c). (remember that this is for a single point in time, so it doesn't have time factored into it) What does the "a" in the equation represent?
9. Use the above equation to determine the height of a wave at x=5 meters, with an amplitude of 2 meters, with a phase shift of 0. Be careful; make sure to acknowledge that "b" in the equation has a "2pi" component to it!
10. Determine the refracted angle of a light beam traveling from air to water, with the beam striking 15 degrees to the normal. n of air=1.00, n of water=1.33.
11. Use the above information to determine the critical angle when a light beam travels between the water-air surface.
5. Transverse: Electromagnetic, S-Waves. Longitudinal: Sound, P-Waves. Surface: Water waves, Rayleigh waves 6. Longest-Radio, Microwaves, Infrared, UV, X-Ray, Gamma rays-Highest 7. Flick with more energy, move the rope higher and lower.
9. Use the above equation to determine the height of a wave at x=5 meters, with an amplitude of 2 meters, with a phase shift of 0. Be careful; make sure to acknowledge that "b" in the equation has a "2pi" component to it!
10. Determine the refracted angle of a light beam traveling from air to water, with the beam striking 15 degrees to the normal. n of air=1.00, n of water=1.33.
11. Use the above information to determine the critical angle when a light beam travels between the water-air surface.
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