Thursday, 27 September 2012

Inverse Square Law

Inverse Square Law

  • The intensity of the sound received varies inversely as the square of the distance R from the source
    ie. as 1/R².
  • In open air, sound will be roughly nine times less intense at a distance of 3m from its origin, as at a distance of 1m.
  • Objects in our surroundings produce reflection (echo), absorption and scattering of the sound waves.
  • The inverse square law is not always applicable in direct measurements of the intensity of sound.
  • However is it a rough indication when you are away from reflecting surfaces eg. open air away from walls. 

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