14 questions · 14 marks · ≈ 14 min
The following statements are about waves.
| 1 | Waves can travel through free space |
|---|---|
| 2 | Waves can be polarised |
| 3 | Waves have a frequency inversely proportional to their wavelength |
| 4 | Waves have an intensity proportional to their amplitude |
Which ones would apply to both sound and light waves?
Choose your answer
3 only
4 only
1 and 4
1 and 2
The shortest wavelength of ultraviolet waves have a frequency in the order of magnitude of 10x Hz.
What is the value of *x *?
Choose your answer
19
17
16
13
Which of the following statements shows that sound waves are longitudinal?
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sound is diffracted around corners
sound is refracted as it passes from hot air to cold air
sound cannot be polarised
sound can be reflected from a solid surface
Fig 1.1 shows a longitudinal wave.
Fig. 1.1
Which label correctly shows the wavelength of a longitudinal wave?
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Which pair contains one transverse and one longitudinal wave?
| A. | Water wave | Visible light |
|---|---|---|
| B. | X-ray | Ultrasound |
| C. | Primary (P) wave | Sound wave |
| D. | Infrared wave | Vibration on a guitar string |
Choose your answer
Sound travels with a speed of 330 m s–1 in air. The variation with time of the displacement of an air particle due to a sound wave is shown below.
Which of the following statements about the wave is correct?
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the wavelength of the sound wave is 1.32 m
the graph shows that the sound is a transverse wave
the frequency of the wave is 500 Hz
the intensity of the wave will be doubled if its amplitude is increased to 0.4 mm
A wave is travelling through a medium at 24 m s–1 with a frequency of 15 Hz.
What is the phase difference between two points 2 m apart?
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They are out of phase by half a cycle.
There is no phase difference.
They are out of phase by a quarter of a cycle.
They are out of phase by 0.8 of a cycle.
What is the frequency, amplitude and period of the wave shown in the graph below, to 2 significant figures?
| Period / s | Frequency / Hz | Amplitude / m | |
|---|---|---|---|
| A B C D | 0.0042 0.0035 0.0031 0.0027 | 240 290 320 290 | 0.013 0.0065 0.013 0.0065 |
Choose your answer
The graph shows the displacement of a sound wave over time.
When the intensity of the wave is halved, which graph shows the correct displacement of the wave ?
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The graph shows two waves P and Q.
Wave P has an amplitude of 8 cm and a frequency 100 Hz.
What is the amplitude and the frequency of wave Q?
| Amplitude / cm | Frequency / Hz | |
|---|---|---|
| A B C D | 4 4 2 2 | 300 33 300 33 |
Choose your answer
The graph below shows two sound waves, the sound wave is a series of moving pressure variations.
Wave 1 has an intensity of 1.6 × 10–6 W m–2, what is the intensity of wave 2 ?
Choose your answer
2.4 × 10–6 W m–2
3.0 × 10–6 W m–2
3.6 × 10–6 W m–2
4.5 × 10–6 W m–2
Fig 1.1 shows a displacement-distance graph of a transverse wave at t = 0 s. The wave is travelling at 64 m s-1. Particle R is marked at a position of 0.2 m.
Fig. 1.1
What would be the phase difference between the position of Particle R at t = 0 s and t = 0.034 s?
Choose your answer
7.0°
49°
100°
260°
A source emits a sound wave and moves away from an observer at a speed of 85 m s-1. Fig 1.1 shows the displacement-distance graph of the sound wave at the source.
Fig. 1.1
What is the observed frequency of the sound wave?
The speed of sound, v = 340 ms-1
Choose your answer
1300 Hz
1400 Hz
1700 Hz
2100 Hz
Fig 1.1 shows two longitudinal waves, wave A and wave B, over time t. Wave A has an intensity of IA.
Fig. 1.1
Assuming both waves have equal amplitude, what is the intensity of wave B?
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