Physics (AS & A Level) · Feb / March 2016 · Paper 12 · Question 21
9702Doppler effect for sound waves
A distant star is receding from the Earth with a speed of 1.40 × 10^7 m s^–1. It emits light of frequency 4.57 × 10^14 Hz. The speed of light is 3.00 × 10^8 m s^–1. The Doppler effect formula can be used with light waves. What will be the frequency of this light when detected on Earth?
- A2.04 × 10^13 Hz
- B4.37 × 10^14 Hz
- C4.57 × 10^14 Hz
- D4.79 × 10^14 Hz
As printed in the paper
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Correct answer: B. 4.37 × 10^14 Hz
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