Class 9 Sound Chapter Quiz

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Questions and Answers

What is the primary medium for the propagation of sound waves?

  • Water
  • Vacuum
  • Metal
  • Air (correct)

What is the unit of measurement for the frequency of a sound wave?

  • Joule
  • Watt
  • Decibel
  • Hertz (correct)

What property of a sound wave determines its loudness?

  • Frequency
  • Wavelength
  • Amplitude (correct)
  • Speed

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Study Notes

Sound Waves

  • The primary medium for the propagation of sound waves is a medium with elasticity, such as air, water, or solid objects.
  • The unit of measurement for the frequency of a sound wave is Hertz (Hz).
  • The property of a sound wave that determines its loudness is amplitude.

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