Exam-style question
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What does the term 'Doppler shift' refer to in the context of astronomy?.
- A.A change in the frequency of light due to motion
- B.A change in the brightness of a star
- C.A change in the color of a planet
- D.A change in the temperature of a galaxy
Model answer
What a good answer should say
- A change in the frequency of light due to motion
Explanation
Why this works
The Doppler shift refers to the change in frequency (and thus wavelength) of light from an object due to its motion relative to the observer, which is crucial for understanding redshift and the expansion of the universe.
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