Exam-style question
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How does the Doppler effect relate to the observed redshift of light from galaxies?.
- A.It causes the light to become brighter
- B.It causes the light to shift towards shorter wavelengths
- C.It causes the light to shift towards longer wavelengths
- D.It has no effect on the light
Model answer
What a good answer should say
- It causes the light to shift towards longer wavelengths
Explanation
Why this works
The evidence of the Doppler effect shows that as an object moves away from an observer, the wavelengths of light are stretched, resulting in a redshift. This implies that the observed redshift is a direct consequence of the Doppler effect, leading to the conclusion that the object is receding.
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