A train travels in a straight line at a constant speed of 30 m s⁻¹. The train's horn continuously emits sound of frequency 2400 Hz. A stationary observer stands next to the train track. The train approaches the stationary observer, passes him and then moves away. The speed of sound is 340 m s⁻¹. What is the maximum difference in the frequencies of the sound heard by the stationary observer?

Q: What topic does this question test?

This question tests Waves in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Oct/Nov 2021 examination, Paper 1 Variant 2 (9702_w21_qp_12.pdf).

Question

A train travels in a straight line at a constant speed of 30 m s⁻¹. The train's horn continuously emits sound of frequency 2400 Hz. A stationary observer stands next to the train track. The train approaches the stationary observer, passes him and then moves away. The speed of sound is 340 m s⁻¹. What is the maximum difference in the frequencies of the sound heard by the stationary observer?

Oracle Prep · Accepted Answer

The correct answer is C: 430 Hz.

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