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physics Physics For High Schools (KS4)
 
Solved problems for the chapter:
 

Ultrasound

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Sound Waves
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Detailed solution steps are available at:
 
https://en.openprof.com/wb/chapter:ultrasound/3618/


Example 1.

What is ultrasound?


  • sound waves that are so loud that they damage human hearing

  • sound waves that are too low-pitched for humans to hear

  • sound waves that are too quiet for humans to hear

  • sound waves that are too high-pitched for humans to hear

    
Example 2.

A student listens to a machine that makes sounds of different frequencies. He can only hear one of the sounds. Which frequency of sound is the student able to hear?






    
3.

Which statement about ultrasound is correct?


  • It is produced by a rapidly vibrating source.

  • It is uncomfortable to human ears.

  • Its frequency must be greater than .

  • It travels the fastest in a vacuum.

    
4.

Which statement about ultrasound is correct?


  • It has a higher frequency than audible sound, and it is a longitudinal wave.

  • It has a higher frequency than audible sound, and it is a transverse wave.

  • It has a lower frequency than audible sound, and it is a longitudinal wave.

  • It has a lower frequency than audible sound, and it is a transverse wave.

    
5.

A student makes a list of some applications of waves.


  • medical scanning of soft tissue

  • sterilising water

  • using sonar to calculate ocean depths


Which applications use ultrasound waves?


  • 1, 2 and 3

  • 1 and 2 only

  • 1 and 3 only

  • 2 and 3 only

    
6.

Ultrasound is used in a hospital to scan a patient. Ultrasound refracts at the boundary between muscle and bone because it travels at a greater speed in bone. Which change takes place when the ultrasound travels from muscle into bone?


  • The frequency of the wave decreases.

  • The frequency of the wave increases.

  • The wavelength of the wave decreases.

  • The wavelength of the wave increases.

    
7.

A student investigates sound waves from a loudspeaker. The frequency of the sound wave is . The student has normal hearing but she cannot hear the sound. What should she do if she wants to hear a sound from the loudspeaker?


  • decrease the amplitude

  • decrease the frequency

  • increase the amplitude

  • increase the frequency

    
8.

Which statement about ultrasound is correct?


  • Ultrasound must have greater amplitude than audible sound.

  • Ultrasound must have greater frequency than audible sound.

  • Ultrasound must have lower amplitude than audible sound.

  • Ultrasound must have lower frequency than audible sound.

    

9.

Which description of ultrasound is correct?


  • longitudinal waves with a frequency greater than

  • longitudinal waves with a frequency less than

  • transverse waves with a frequency greater than

  • transverse waves with a frequency less than

   
10.

A dolphin has a range of audible frequencies of . Which range of frequencies can be heard both by humans with good hearing and by dolphins?






    
11.

What is the approximate wavelength in air of the highest frequency sound that can be heard by a normal healthy person?






    
12.

The diagram shows the ranges of human hearing and of ultrasound waves.




To which characteristic of sound waves do the numbers on the diagram refer?


  • amplitude in

  • frequency in

  • speed in

  • wavelength in

   
13.

Three loudspeakers vibrate at different frequencies 5 hertz, 25 kilohertz, and 50 kilohertz.




Which row shows whether the vibrations from each loudspeaker can be heard by a human?


 5 hertz25 kilohertz50 kilohertz
Anonono
Bnoyesno
Cyesnoyes
Dyesyesyes
    
14.

Which of the following can be heard by the human ear?


  • A whistle emitting a wave of frequency .

  • A bat emitting a wave of frequency .

  • An insect emitting a wave of frequency .

  • A vibrating string emitting a wave of frequency .

    
15.

What is the approximate range of audible frequencies for most humans?






    
16.

What is the approximate value of the highest frequency that can be heard by a young person?






    
17.

Sounds are made by vibrating objects. A certain object vibrates but a person nearby cannot hear any sound. Which statement might explain why nothing is heard.


  • The amplitude of the sound waves is too large.

  • The frequency of the vibration is too high.

  • The sound waves are transverse.

  • The speed of the sound waves is too high.

    
18.

Which range of frequencies typically can be heard by a 10 year-old child?






    

19.

A sound wave has a wavelength of . What is the frequency of this sound wave and is it audible to humans?


 frequency ()audible to humans
A140yes
B140no
C14000yes
D14000no