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Physics for IGCSE & O level - Waves And Sounds (Section 6)

1
What is the relationship between the speed of a wave and the medium it travels through?
Answer
(B)
The speed of the wave depends on the medium.
2
Which of the following are characteristics of sound waves?
Answer
A
B
C
D
3
In what units is speed of a wave usually measured?
Answer
(C)
Meters per second (m/s)
4
What is the relationship between frequency and pitch?
Answer
(D)
As frequency increases, pitch increases.
5
What happens to the speed of a wave if the frequency increases?
Answer
(A)
The speed increases.
6
What is the speed of sound in air approximately?
Answer
(A)
340 m/s
7
Which of these terms describe sound waves?
Answer
B
C
8
What is the term for when waves combine to form a wave with a greater amplitude?
Answer
(B)
Constructive interference
9
What happens to the wavelength of a sound wave if the frequency is increased?
Answer
(B)
Wavelength decreases
10
What is a key difference between sound waves and light waves?
Answer
(B)
Sound waves require a medium, light waves do not.
11
What is the name given to a sound wave above the range of human hearing?
Answer
(C)
Ultrasonic
12
What does the term 'transverse wave' refer to?
Answer
(A)
A wave that moves perpendicular to the direction of energy transfer.
13
Which of these is NOT listed as a use of ultrasound?
Answer
(D)
Measuring the speed of a car
14
Which type of wave does not require a medium to travel?
Answer
(C)
Light wave
15
What is the relationship between frequency and wavelength?
Answer
(B)
Inversely proportional
16
What is an echo?
Answer
(B)
A reflected sound wave.
17
What is echo-sounding used for?
Answer
(B)
Measuring the depth of water
18
What is the wavelength of the ultrasound in water, if the frequency is 40 kHz and the speed of sound in water is 1400 m/s?
Answer
(A)
0.035 m
19
In which medium will a sound wave travel the slowest?
Answer
(A)
Vacuum
20
What factor is used to distinguish different types of sounds?
Answer
(D)
Timbre
21
What is the difference between a sound wave and a light wave?
Answer
(C)
Sound waves are longitudinal, and light waves are transverse.
22
What happens to a wave's direction as it moves into a different medium and its speed increases?
Answer
(B)
The wave bends away from the normal.
23
If the frequency of a sound is 330 Hz and the wavelength is 1 m, what is the speed of the sound wave?
Answer
(A)
330 m/s
24
When the amplitude of a sound wave increases, what happens to its loudness?
Answer
(B)
Loudness increases
25
What is the number of oscillations per second called?
Answer
(C)
Frequency
26
In sound waves, what do compressions and rarefactions represent?
Answer
(B)
High and low pressures
27
What is the range of human hearing, approximately?
Answer
(A)
20 Hz to 20 kHz
28
In ultrasound, what does the machine do with the reflected pulses?
Answer
(B)
It uses them to create an image
29
Which of the following is an example of a transverse wave?
Answer
(B)
Light
30
What is the unit for measuring the period of a wave?
Answer
(C)
Seconds (s)
31
How does the frequency affect the wavelength?
Answer
(B)
As frequency decreases, the wavelength increases.
32
What type of wave is used in ultrasound?
Answer
(A)
Sound waves with a very high frequency.
33
What is the name given to the bending of waves around obstacles?
Answer
(C)
Diffraction
34
Which of the following terms describes the 'height' of a sound wave on an oscilloscope?
Answer
(C)
Amplitude
35
What is the relationship between the frequency and pitch of a sound?
Answer
(D)
Higher frequency, higher pitch
36
Which of the following is NOT a characteristic of sound waves?
Answer
(D)
Temperature
37
What type of wave is used in echo-sounding?
Answer
(B)
Sound waves
38
What type of wave is created when you hit the water with a stick?
Answer
(B)
Transverse waves
39
Why might ultrasound be preferred over X-rays when scanning a pregnant woman?
Answer
(C)
Ultrasound poses less risk of harm to the baby
40
What is a sound wave's medium?
Answer
(C)
The material the sound travels through.
41
What unit is used to measure wavelength?
Answer
(B)
Meters (m)
42
What are two uses of ultrasound?
Answer
A
B
43
What unit is used to measure the frequency of a wave?
Answer
(B)
Hertz
44
Which of these is related to the loudness of a sound?
Answer
(C)
Amplitude
45
Which wave property determines the amount of energy a wave carries?
Answer
(C)
Amplitude
46
The range of human hearing is about:
Answer
(A)
20 Hz to 20,000 Hz
47
What is the term for the time it takes for one complete wave cycle to pass a given point?
Answer
(C)
Period
48
What is the relationship between frequency and wavelength?
Answer
(B)
They are inversely proportional.
49
If two sounds have the same pitch, but different amplitudes, how would they differ?
Answer
(B)
One would be louder than the other.
50
How do you calculate the depth of water when using echo-sounding?
Answer
(C)
(Speed of sound * time) / 2