A wave has a frequency of 4 GHz.
What is the period of the wave?
25 000 μs
250 ps
25 ns
2.5 ns
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Syllabus Edition
First teaching 2020
Last exams 2024
A wave has a frequency of 4 GHz.
What is the period of the wave?
25 000 μs
250 ps
25 ns
2.5 ns
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A light with wavelength of 600 nm has an orange colour.
What is the frequency of this light?
500 kHz
500 THz
180 GHz
180 Hz
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A sound wave has a frequency of 50 Hz and a speed of 330 m s–1
If two waves have a phase difference of 60˚, what is the possible distance between two points on the wave?
6.6 m
2.2 m
1.1 m
0.03 m
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A sound wave has a displacement y at a distance x from its source at time t.
Which graph shows correctly the amplitude a and the wavelength λ of the wave ?
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The following are statements about waves.
1 |
Longitudinal waves can be polarised. |
2 |
The amplitude of a wave is directly proportional to the energy transferred by the wave. |
3 |
All electromagnetic waves travel at the same speed in a vacuum. |
4 |
The frequency of infra-red light is greater than the frequency of ultra-violet light. |
Which ones are incorrect?
1, 3 and 4
1, 2 and 4
1, 2 and 3
2, 3 and 4
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The vertical cross-section diagram shows a water wave moving from left to right.
Which points on the diagram show the water moving upwards with maximum speed?
1 and 3
3 only
1 and 4
4 only
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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?
3 only
4 only
1 and 4
1 and 2
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The diagram below is a graph showing how the height of water at a point in a marina varies with time t as the waves pass the point.
What is the correct label for W and X?
|
W |
X |
A B C D |
amplitude displacement amplitude displacement |
period wavelength wavelength period |
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Ultraviolet waves have an order of magnitude of the frequency of the longest-wavelength of 10x Hz.
What is the value of x ?
19
17
16
13
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Which of the following statements shows that sound waves are longitudinal?
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
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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?
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
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The graph shows two light waves travelling at the same frequency.
Which of the following could be the phase difference between the two waves?
330˚
260˚
220˚
150˚
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The diagram shows a wave moving along a stretched rope in the direction shown.
Which of the following will be the correct graph to show the variation with time t of the displacement s of the particle Q in the rope ?
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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?
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.
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A plan polarised light of amplitude A is passed through a polarising filter as show in the diagram. The emerging light has an amplitude of A cos
If the intensity of the beam is I, what is the intensity of the emerging light when θ is 60.0˚?
0.866 I
0.750 I
0.500 I
0.250 I
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A police car siren emits a sound wave with a frequency fs of 440 Hz. The car is travelling away from an observer at a speed of 30 m s−1.
The speed of sound is 340 m s−1.
Which of the following is the frequency the observer hears?
478 Hz
460 Hz
440 Hz
404 Hz
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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 |
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A sound wave with an amplitude a of 0.2 mm has an intensity of 2.5 W m–2
If a wave with the same frequency has an amplitude of 2a what is the intensity of the wave?
10.0 W m–2
9.0 W m–2
6.0 W m–2
4.2 W m–2
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A sound wave can be displayed on a cathode ray oscilloscope (C.R.O.). The time base is set to 5 μs mm-1.
What is the frequency of the sound wave?
83 Hz
8.3 Hz
83 kHz
8.3 kHz
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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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A source of sound power P is situated in an open space. The intensity I of sound at distance r from this source is given by
How does the amplitude A of the vibrating air molecules vary with the distance r from the source ?
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The equation below shows the speed of v waves in deep water
Where g is the acceleration of free fall and λ is the wavelength of the waves. The wavelength λ and the frequency f of the wave were measured.
If the graph was to give a straight line through the origin which of the following graphs should be plotted?
f against λ2
f 2 against λ
f against
f 2 against
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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 |
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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 ?
3.6 × 10–6 W m–2
2.4 × 10–6 W m–2
3.0 × 10–6 W m–2
4.5 × 10–6 W m–2
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A light wave is incident normally on a surface of area S with an amplitude A. The power per unit area reaching the surface is P.
If the light is focused on a smaller area of , and the amplitude of wave is doubled to 2A what is the power per unit area?
6P
12P
18P
36P
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All electromagnetic waves travel at speed c in a vacuum with a frequency f and wavelength λ.
Which row in the table describes the wavelength and speed of electromagnetic waves with a frequency ?
|
Speed in a vacuum |
Wavelength |
A |
2c |
2λ |
B |
c |
2λ |
C |
c |
|
D |
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Sound waves can be displayed on a cathode ray oscilloscope (C.R.O.). The graph below represents two waves seen on the screen. They are labelled P and Q as shown in the diagram
What is the ratio ?
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The intensity I of a sound at point Q is inversely proportional to the square of the distance x of Q from the source of the sound. This can be shown by the equation
Molecules of air at Q are a distance r from S and oscillate with amplitude 8.0 μm.
Point T is a distance 2r from S.
What is the amplitude of oscillation of air molecules at T?
4.0 μm
2.0 μm
2.8 μm
1.4 μm
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The graph shows a sinusoidal wave in water travelling at a speed of 8.0 m s–1.
The maximum speed of the particles in the wave is , where a is the amplitude and f is the frequency.
An object Q is floating on the water it has a mass of 2.5 × 10–3 kg.
What is the maximum kinetic energy of Q due to the wave? Assume the motion is vertical.
4.1 mJ
5.1 mJ
39 mJ
64 mJ
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A wave has a speed of 340 m s–1 and a frequency of 500 Hz
If two points on a wave are 0.17 m apart, what is the phase difference?
rad
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The sun emits light of a particular wavelength λs. At any instant, there is a range of wavelengths from less than λs to greater than λs that can be observed on Earth. This is due to the Doppler effect.
Which of the following statements would explain this Doppler effect?
the Sun is rotating
the Sun is moving toward the Earth
the Sun is moving away from the Earth
the Sun is moving at right-angles to a line joining the Sun and the Earth
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