Crave the Wave B

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John Richardsim
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Crave the Wave B

Postby John Richardsim » August 30th, 2015, 5:56 pm

Okay, let's get the Question Marathons populated (starting here).

What is an oscillation? How is an oscillation related to a wave?
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Re: Crave the Wave B

Postby ampy1234567 » August 31st, 2015, 4:12 am

An oscillation is a regular periodic motion. Oscillations are related to waves in that waves are a type of oscillations.
Hm not sure too sure about second part
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John Richardsim
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Re: Crave the Wave B

Postby John Richardsim » August 31st, 2015, 5:38 am

An oscillation is a regular periodic motion. Oscillations are related to waves in that waves are a type of oscillations.
Hm not sure too sure about second part
Yeah, I'll accept it. Your turn!
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Re: Crave the Wave B

Postby ampy1234567 » September 1st, 2015, 5:26 am

Say that galaxy A is actually blue, but appears red from planet B. If planet B is moving at a rate of 0.2c southward and galaxy A is moving at a rate of k*c northward, find k. Assume that the wavelengths of red and blue are 750 and 450 nm respectively, and ignore any possible effects of relativity.
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Adi1008
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Re: Crave the Wave B

Postby Adi1008 » October 9th, 2015, 8:51 pm

Say that galaxy A is actually blue, but appears red from planet B. If planet B is moving at a rate of 0.2c southward and galaxy A is moving at a rate of k*c northward, find k. Assume that the wavelengths of red and blue are 750 and 450 nm respectively, and ignore any possible effects of relativity.
I thought I did this question but it looks like I forgot to submit it or something :/

Anyways, here's what I got:
[b] k = 1/3[/b]. Work is here: http://imgur.com/JDUcEoF I got different answers doing it different ways, so it could be wrong T_T
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Re: Crave the Wave B

Postby ampy1234567 » October 10th, 2015, 2:25 pm

Yeah that's right
I had the same work as you BTW
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Re: Crave the Wave B

Postby Adi1008 » October 11th, 2015, 6:50 pm

Yeah that's right
I had the same work as you BTW
When light passes through a different medium and slows down or speeds up, does the frequency or the wavelength change? Why?
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Re: Crave the Wave B

Postby ampy1234567 » October 17th, 2015, 6:55 am

The wavelength changes. This is because the wave equation, which is (lamba)*f=speed, shows that a change in speed will cause changes in the frequency and/or the wavelength. Since the frequency remains constant (otherwise you would probably have a large "pile-up" of waves near the interface), wavelength therefore must change.
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Re: Crave the Wave B

Postby amydata123 » December 30th, 2015, 4:47 pm

no one has done a question for a while, so.........

8. As observed from the Earth, the light from a star is shifted
toward lower frequencies. This is an indication that the
distance between the Earth and the star is
(1) decreasing (3) constant
(2) increasing
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Re: Crave the Wave B

Postby ampy1234567 » December 31st, 2015, 4:55 pm

2: Increasing
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