Exam code: H156
A stationary sound wave formed in a tube is shown below.
The tube is closed at one end. The length of the tube is 3.5 m.
The speed of sound is 340 m s–1.
What is the frequency of the sound wave?
97 Hz
120 Hz
240 Hz
486 Hz
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A progressive wave of amplitude a has intensity I. This wave combines with another wave of amplitude 0.6a at a point in space. The phase difference between the waves is 180°.
What is the resultant intensity of the combined waves in terms of I?
0.16 I
0.4 I
1.6 I
2.6 I
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A small loudspeaker emits sound uniformly in all directions.
The amplitude of the sound is 12 μm at a distance of 1.5 m from the loudspeaker.
What is the amplitude of the sound at a distance of 4.5 m from the loudspeaker?
1.3 μm
4.0 μm
6.9 μm
12 μm
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The displacement against time graph for a progressive wave is shown below in Figure 1
Figure 1
Which statement is correct about the phase difference ? between points A and B?
0° < σ < 90°
σ = 90°
σ = 180°
90° < σ < 180°
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The graph in Figure 2 shows how a sound signal wave displacement varies with time t. The speed of the signal is 334 m s−1.
Figure 2
What is the time period T (µs) of the sound signal?
29.9 µs
299 µs
2990 µs
29900 µs
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