A loudspeaker producing sound of constant frequency is placed near the open end of a pipe, as shown in Fig. 4.1.
[Figure 4.1]
A movable piston is at distance x from the open end of the pipe. Distance x is increased from x = 0 by moving the piston to the left with a constant speed of 0.75cms⁻¹.
The speed of the sound in the pipe is 340ms⁻¹.

Q: What topic does this question test?

This question tests Waves in A-Level Physics (syllabus code 9702). It is worth 7 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2018 examination, Paper 2 Variant 2 (9702_s18_qp_22.pdf).

Question

A loudspeaker producing sound of constant frequency is placed near the open end of a pipe, as shown in Fig. 4.1.
[Figure 4.1]
A movable piston is at distance x from the open end of the pipe. Distance x is increased from x = 0 by moving the piston to the left with a constant speed of 0.75cms⁻¹.
The speed of the sound in the pipe is 340ms⁻¹.

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