Multiple Choice
The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
A) The star has a radial velocity towards us.
B) The second law of Kirchhoff explains this.
C) The star is not rotating.
D) This is an example of the photoelectric effect.
E) This is an example of the Doppler effect.
Correct Answer:
Verified
Correct Answer:
Verified
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