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Consumer Electronics by S. P. Bali

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PROPERTIES OF SOUND WAVES

The properties of sound waves can be summed up as follows.

  1. Sound waves are longitudinal waves.
  2. Sound travels through all states of matter.
  3. The velocity of sound is maximum in solids and least in gases.
  4. Sounds which can be heard by human beings are known as audible sounds. Their frequency range is from 20 to 20,000 Hz.
  5. Sounds of frequencies greater than 20,000 Hz are called ultrasonic sounds. Ultrasonic sounds can be received and emitted by bats.
  6. Sounds of frequencies less than 20 Hz are called infrasonic sounds. Infrasonic sounds can be received by snakes.
  7. Sound waves can be reflected. In the phenomenon of reflection, the speed, frequency and wavelength of the sound waves do not change.
  8. Sound waves can be refracted. ...

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