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14 Worksheet (AS) Waves: 1 The Diagram Shows A Graph of The Displacement of A Wave

This document contains 11 multiple choice and calculation questions about waves, including: 1) Questions about properties of waves like amplitude, frequency, and wavelength using diagrams of wave displacement over time. 2) Calculations involving wavelength, frequency, speed, and period of waves including light, sound, and water waves. 3) Analysis of oscilloscope traces to determine frequency and wavelength of sound waves. 4) Calculations of intensity, power, and amplitude of sound waves using the intensity equation. 5) Explanation of how intensity of light from a point source decreases with distance due to the inverse square law.

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Mahad Asim
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982 views4 pages

14 Worksheet (AS) Waves: 1 The Diagram Shows A Graph of The Displacement of A Wave

This document contains 11 multiple choice and calculation questions about waves, including: 1) Questions about properties of waves like amplitude, frequency, and wavelength using diagrams of wave displacement over time. 2) Calculations involving wavelength, frequency, speed, and period of waves including light, sound, and water waves. 3) Analysis of oscilloscope traces to determine frequency and wavelength of sound waves. 4) Calculations of intensity, power, and amplitude of sound waves using the intensity equation. 5) Explanation of how intensity of light from a point source decreases with distance due to the inverse square law.

Uploaded by

Mahad Asim
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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14 Worksheet (AS) Waves

Data needed to answer questions can be found in the Data, formulae and relationships sheet.
1 The diagram shows a graph of the displacement of a wave.

Displacement X

Time

What property of the wave is X? [1]


A amplitude
B frequency
C period
D wavelength
2 The graph shows the displacement of particles in a sound wave. Which distance, on the graph,
represents the amplitude of the wave?

[1]
14 Worksheet (AS)

3 Which of the following cannot be polarised? [1]


A infrared waves
B microwaves
C sound waves
D ultraviolet waves
4 Red light has a wavelength of 684 nm. What is its frequency? [1]
2
A 2.05 × 10 Hz
B 4.39 × 105 Hz
C 4.39 × 1014 Hz
D 2.05 × 1020 Hz
5 An oscilloscope is connected to a microphone. The diagram shows the trace displayed when a note
is played.

A note is played of half the amplitude and twice the frequency. The settings of the oscilloscope
remain unchanged. Which diagram shows the trace for this note? [1]

A B

C D
14 Worksheet (AS)

6 Calculate the frequency of the following waves:


a red light of wavelength 6.5 × 10−7 m emitted from a light-emitting diode [2]
b ultrasound of wavelength 7.0 mm emitted by a bat. [2]
7 In a water tank, a dipper oscillating at a frequency of 30 Hz produces surface water waves of
wavelength 2.5 cm.
a Calculate the speed of the water waves. [2]
b Determine the wavelength of the waves when the frequency of the dipper is doubled. [2]
8 The graph shows the displacement of particles in a sound wave.

a Calculate:
i the period of the wave [2]
ii the frequency of the wave. [1]
b On a copy of the diagram draw a wave of the same frequency but four times the intensity. [1]
9 An oscilloscope has its time-base and Y-sensitivity (Y-gain) set on 0.5 ms cm−1 and 0.5 V cm−1,
respectively. A person whistles into a microphone connected to the oscilloscope. The trace
displayed on the oscilloscope screen is shown below.

a Determine the frequency of the sound wave. [2]


b Calculate the wavelength of the sound produced by the whistle. [2]
14 Worksheet (AS)

10 You can use the following equation to determine the intensity of a wave:
power
intensity =
cross - sectional area
This equation can be applied to all waves, including sound.
The intensity of sound at a certain distance from a loudspeaker is 3.5 × 10−3 W m−2.
The amplitude of the sound waves at this point is known to be 0.45 mm. Calculate:
a the power transmitted through a cross-sectional area of 8.0 × 10−5 m2 when the intensity
of sound is 3.5 × 10−3 W m–2 [2]
b the intensity of sound where the amplitude is 0.90 mm [3]
c the amplitude of the sound waves where the intensity is 5.6 × 10−2 W m−2. [3]
11 The intensity of a wave may be defined as the power transmitted per unit cross-sectional area at
right angles to the direction of travel.
a For a point source of light, explain why the intensity I at a distance r away from the source
obeys an inverse square law with distance, that is:
1
I∝ . [3]
r2
b The intensity of visible light from the Sun reaching the upper parts of our atmosphere is
about 1.4 kW m−2. The Sun has a radius of 7.0 × 108 m and is 1.5 × 1011 m from the Earth.
Calculate:
i the intensity of visible light emitted from the Sun’s surface [3]
ii the total power radiated by the Sun in the visible region of the electromagnetic
spectrum [2]
iii the intensity of light from the Sun at the planet Neptune.
(Neptune is 4.5 × 1012 m from the Sun.) [3]

Total: Score: %
40

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