Physics for IGCSE & O level - Waves And Sounds (Section 5)
1
If ultrasound pulses take 0.03 s to travel from the boat to the seabed and return, how deep is the water under the boat, assuming the speed of sound in water is 1400 m/s?
Trả lời
(A)
21 m
2
In metal testing, what does the flaw look like on an oscilloscope?
Trả lời
(B)
Two reflected pulses
3
What happens to the frequency when a sound source moves towards you?
Trả lời
(B)
The frequency increases.
4
Which of these are examples of wave interference?
Trả lời
A
C
5
If a pulse of ultrasound takes 0.1 s to travel to the sea-bed and return, and the speed of sound in water is 1400 m/s, what is the depth of the water?
Trả lời
(B)
70 m
6
What is the role of an echo-sounder?
Trả lời
(D)
All of the above
7
What is the difference between transverse and longitudinal waves?
Trả lời
(B)
Longitudinal waves are always in the same direction, while transverse waves move perpendicular
8
What is the range of frequencies humans can hear?
Trả lời
(B)
20 Hz - 20 kHz
9
The speed of sound depends on:
Trả lời
(C)
The medium it travels through
10
What is the Doppler effect?
Trả lời
(B)
The change in frequency of a wave due to the motion of the source or observer.
11
Which wave effect explains why you can sometimes hear a sound even when you can't see its source?
Trả lời
(C)
Diffraction
12
What is being refered to when mentioning the 'quality' of a sound?
Trả lời
(C)
The timbre
13
How are energy and amplitude of a wave related?
Trả lời
(A)
Energy is proportional to amplitude.
14
How does the amplitude of a sound wave affect the loudness of the sound?
Trả lời
(C)
Higher amplitude, higher loudness
15
What is the range of human hearing in terms of frequency?
Trả lời
(B)
20 Hz to 20 kHz
16
What are compressions and rarefactions characteristics of?
Trả lời
(C)
Longitudinal waves
17
What does the amplitude of a sound wave relate to?
Trả lời
(D)
The loudness of the sound
18
What is the relationship between the period and frequency of a wave?
Trả lời
(B)
They are inversely proportional.
19
What is a 'rarefaction' in a sound wave?
Trả lời
(B)
A region where particles are spread out
20
What type of wave is represented by a Slinky being compressed and then stretched?
Trả lời
(B)
Longitudinal Wave
21
What is the name of the effect where the observed frequency of a wave changes due to the motion of the source or the observer?
Trả lời
(D)
Doppler Effect
22
Which of the following is a characteristic of longitudinal waves?
Trả lời
(B)
They require a medium to travel.
23
What is the unit for measuring the speed of sound?
Trả lời
(C)
Meters per second
24
What do musical instruments produce?
Trả lời
(A)
Complex waves
25
In the context of medical applications, why is ultrasound often preferred over X-rays?
Trả lời
(B)
Ultrasound is safer because X-rays can cause cell damage
26
What are the two main types of waves?
Trả lời
(C)
Transverse and longitudinal
27
What is an example of a medical use of ultrasound?
Trả lời
(B)
Breaking kidney stones
28
What is the relationship between the period and the frequency?
Trả lời
(B)
Inversely Proportional
29
What is the role of the ultrasound transmitter/detector in the womb scanning process?
Trả lời
(A)
To send ultrasound pulses and receive reflections
30
Which of the following is an example of reflection?
Trả lời
(B)
An echo
31
Which of these options can be cleaned with ultrasound?
Trả lời
(D)
All of the above
32
What type of wave is produced by a slinky toy when pushed and pulled?
Trả lời
(B)
Longitudinal wave
33
How does the wavelength change when the frequency increases, assuming the speed of the wave remains constant?
Trả lời
(B)
The wavelength decreases.
34
When does refraction of a wave occur?
Trả lời
(C)
When a wave passes from one medium to another and changes speed
35
What is the relationship between speed, frequency, and wavelength?
Trả lời
(C)
Speed = Frequency x Wavelength
36
What type of wave does light represent?
Trả lời
(C)
Transverse wave
37
What happens to the direction of the waves when they encounter a vertical surface?
Trả lời
(A)
They are reflected
38
How is the period of a wave related to its frequency?
Trả lời
(B)
Period = 1 / frequency
39
What is the term for the distance between two successive crests or troughs of a wave?
Trả lời
(C)
Wavelength
40
In which medium do sound waves travel the fastest?
Trả lời
(D)
Solids
41
In a transverse wave, how do the oscillations move in relation to the direction of travel?
Trả lời
(C)
Perpendicular
42
What is ultrasound?
Trả lời
(C)
Sounds above the range of human hearing
43
What type of wave is created when you hit the water with a stick?
Trả lời
(B)
Transverse waves
44
What happens when a wave passes through a small gap (diffraction)?
Trả lời
(B)
The wave bends and spreads out.
45
What happens to the waves when they pass into a shallower water area?
Trả lời
(A)
They change direction
46
What affects the speed of sound?
Trả lời
A
B
C
47
In the context of waves, what does 'speed' refer to?
