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 2023
First exams 2025
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 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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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 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 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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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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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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