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Light and sound

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Question 45
a.

Which of these statements about infrasound waves is not correct?

  • A Infrasound waves are longitudinal waves.
  • B Infrasound waves have a frequency below 20 Hz.
  • C Infrasound waves can travel through a vacuum.
  • D Infrasound waves can be used to monitor volcanic activity.
[1]
b.

A sound engineer uses a microphone and an oscilloscope to analyze a steady tone from a synthesizer. The diagram shows the trace on the oscilloscope screen.

An oscilloscope screen showing a grid and a sinusoidal wave trace.

Calculate the frequency of this sound wave.

[3]
c.

Describe how the amplitude and the wavelength of the trace on the screen would change if the synthesizer played a quieter tone of a higher pitch.

[2]

Light and sound Questions

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