You observe the spectra of two identical stars, A and B, shown below. Assume tha
ID: 1481813 • Letter: Y
Question
You observe the spectra of two identical stars, A and B, shown below. Assume that the left end of each spectrum corresponds to shorter wavelengths and that the right end of each spectrum corresponds with longer wavelengths. Star A is at rest relative to us. Which of the following statements best describes how Star B is moving?
Star B is blueshifted relative to Star A, and is moving toward us.
Star B is redshifted relative to Star A, and is moving away from us.
Both sources are at rest.
Without knowing the actual wavelengths of the absorption lines, there is no way to tell
Link to picture: http://postimg.org/image/wtevpy1hd/
A.Star B is blueshifted relative to Star A, and is moving toward us.
B.Star B is redshifted relative to Star A, and is moving away from us.
C.Both sources are at rest.
D.Without knowing the actual wavelengths of the absorption lines, there is no way to tell
Explanation / Answer
Star B is redshifted relative to Star A, and is moving away from us.
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