The Observed Spectral Lines of a Star Are All Shifted

question 4

Multiple Choice

The observed spectral lines of a star are all shifted towards the red end of the spectrum.Which statement is true?

• A)This is an example of the photoelectric effect.
• B)This is an example of the Doppler effect.
• C)The second law of Kirchhoff explains this.
• D)The star is not rotating.
• E)The star has a radial velocity towards us.

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