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