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Author Question: If the rest wavelength of a certain line is 600 nm., but we observe it at 594 nm (Read 2237 times)

plus1

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on: Aug 28, 2013
If the rest wavelength of a certain line is 600 nm., but we observe it at 594 nm, then
A) the source is approaching us at 1 % of the speed of light.
B) the source is approaching us at 0.1 % of the speed of light.
C) the source is receding from us at 10% of the speed of light.
D) the source is getting 1% hotter as we watch.
E) the source is spinning very rapidly, at 1% of the speed of light.


notis

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Reply #1 on: Aug 28, 2013
I know the answer! It's A.


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