Cosmology (Edexcel A Level Physics): Exam Questions

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The diagram shows a source of sound waves and an observer.

q6-nov-2021-9ph0-02-edexcel-as-a-level-phy

Which row of the table shows a situation which would result in a decrease in the frequency of sound observed?

 

Source

Observer

A

moves to the right at 20 ms−1

moves to the left at 20 ms−1

B

moves to the right at 20 ms−1

moves to the right at 20 ms−1

C

moves to the right at 20 ms−1

stationary

D

stationary

moves to the right at 20 ms−1

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