Home / CIE AS & A Level Physics : 7.1 Progressive waves – Exam style question – Paper 1

CIE AS & A Level Physics : 7.1 Progressive waves – Exam style question – Paper 1

Question

Graph 1 shows the variation with time of displacement at a fixed distance along a progressive wave.
Graph 2 represents the same wave and shows the variation with distance of displacement at an instant in time.

What is the speed of the wave?
(A) 5.0cm$s^{-1}$

(B) 48cm$s^{-1}$

(C) 150cm$s^{-1}$

(D) 300cm$s^{-1}$

Answer/Explanation

Ans: D

Question

A progressive wave of frequency 1.5 kHz travels in a medium at a speed of 340 m $s^{-1}$. 
What is the minimum distance between two points on the wave that have a phase difference of 70$\circ$ ?
(A) 4.4 cm

(B) 8.8 cm

(C) 18 cm

(D) 23 cm

Answer/Explanation

Ans: A

Question

A microphone detects a sound wave. The microphone is connected to a cathode-ray oscilloscope (CRO).


The shape of the trace on the screen of the CRO is shown.

▶️Answer/Explanation

Ans: B

Question

The graph shows the variation with time of the displacement of a particle in a progressive wave.

Two measurements, x and y, are labelled on the graph. What do x and y represent?

▶️Answer/Explanation

Ans: A

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