The Observed Spectral Lines of a Star Are All Shifted

question 53

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.

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