Sign In

Physics for IGCSE & O level - Waves And Sounds (Section 4)

1
What is the lower limit of human hearing?
Answer
(A)
20 Hz
2
Which part of the ear is responsible for detecting sound?
Answer
(B)
The cochlea
3
How does the temperature of a medium affect the speed of sound?
Answer
(B)
Higher temperature, faster speed
4
What term describes the bending of waves around obstacles?
Answer
(C)
Diffraction
5
In the case of ultrasound use in metal testing, what feature makes a flaw detectable?
Answer
(A)
Reflection of ultrasound
6
Which factor mainly determines the loudness (volume) of a sound?
Answer
(C)
Amplitude
7
What is the unit of the wavelength?
Answer
(B)
Meters (m)
8
What is the effect of a change in the medium on wave behavior?
Answer
(B)
Refraction
9
What is the typical speed of sound in air?
Answer
(A)
340 m/s
10
What happens to a wave's energy if its amplitude is doubled?
Answer
(B)
The energy quadruples.
11
Which of the following is most directly determined by the amplitude of a sound wave?
Answer
(B)
Loudness
12
Which of the following is a characteristic of a sound wave?
Answer
(C)
It requires a medium to travel.
13
Which of the following is an example of a transverse wave?
Answer
(C)
Light waves
14
What is the approximate upper limit of human hearing?
Answer
(B)
20 kHz
15
Which of the following is a use of ultrasound?
Answer
(A)
Cleaning delicate machinery
16
What is the speed of sound in air approximately?
Answer
(B)
340 m/s
17
Which characteristics of a wave can be used to find the speed of a wave?
Answer
A
C
D
18
What is a common application of ultrasound for medical purposes?
Answer
(B)
Scanning the womb
19
If the speed of sound in the air is 340 m/s and the frequency is 170 Hz, what is the wavelength of the sound?
Answer
(C)
2 m
20
What type of wave causes the phenomenon of an echo?
Answer
(A)
Reflected wave
21
What is the formula for calculating the speed of a wave?
Answer
(C)
Speed = Frequency x Wavelength
22
What information does a computer display after receiving data from the echo sounder?
Answer
(C)
The depth information
23
What causes the change in pitch when a sound source moves relative to an observer?
Answer
(D)
The Doppler effect
24
What is the function of the oscilloscope in displaying sound waves?
Answer
(B)
To show the waveform of the sound
25
Which statement best describes the direction of movement in a longitudinal wave?
Answer
(C)
The movement is parallel to the wave's direction.
26
In the wave equation, what does the 'λ' symbol represent?
Answer
(C)
Wavelength
27
Which of the following factors affect the speed of a wave?
Answer
(C)
The medium it travels through.
28
What happens to waves when they meet?
Answer
(B)
They pass through each other.
29
What does a microphone do?
Answer
(B)
Converts sound waves into electrical signals.
30
How is the depth of the water calculated using echo-sounding?
Answer
(C)
1/2 * (Speed of sound * time)
31
Which of the following is NOT a property of a wave?
Answer
(D)
Color
32
Which property of a sound wave is related to the amount of energy it carries?
Answer
(C)
Amplitude
33
What is the frequency of the ultrasound in Hz if the speed of sound in water is 1400 m/s and the wavelength is 0.035 m?
Answer
(A)
40 kHz
34
How is the term 'quality' in reference to sound?
Answer
(C)
Timbre
35
What is one industrial use of ultrasound?
Answer
(B)
Detecting flaws in metals
36
What unit is used to measure the frequency of a wave?
Answer
(B)
Hertz (Hz)
37
What is a 'medium' in the context of wave propagation?
Answer
(B)
The substance or material through which the wave travels.
38
Which of the following is a characteristic of a wave that is related to the distance between wave crests?
Answer
(B)
Wavelength
39
What happens to the speed of sound if the temperature of the medium increases?
Answer
(B)
It increases.
40
In the Doppler effect, what happens to the observed frequency if the source of the wave and the observer are moving closer together?
Answer
(B)
The frequency increases.
41
What is the term for the maximum displacement of a wave from its rest position?
Answer
(C)
Amplitude
42
What type of wave are sound waves?
Answer
(C)
Longitudinal
43
Which factors are related to the pitch of sound?
Answer
(A)
Frequency
44
Which wave effect is used by sonar?
Answer
(A)
Reflection
45
Which wave phenomenon explains why a straw appears bent in a glass of water?
Answer
(B)
Refraction
46
What happens to a wave's energy as its amplitude increases?
Answer
(B)
The energy increases.
47
Which of the following is a practical application of ultrasound?
Answer
(B)
Scanning a baby in the womb
48
In the metal testing diagram, what causes the pulses?
Answer
(B)
The flaws in the metal
49
What is described as a repeating disturbance that transfers energy through matter or space?
Answer
(B)
Wave
50
What type of waves are ultrasonic waves?
Answer
(B)
Longitudinal waves