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The Doppler effect responds only to the part of a star's motion that is:
AAcross the sky
BAround a circle
CAlong a spiral
DTowards or away
Answer & Solution
Correct answer: D. Towards or away
1. Sideways motion does not stretch or squeeze the waves.
2. Only motion along the line of sight does.
3. That is motion towards or away.
_Source: OpenStax Astronomy 2e, Chapter 5, Radiation and Spectra._
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