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Ch. 13 . Sound. Sound Intensity. Intensity – the rate of energy flow through a given area. Units for Power – watt (W) Units for distance – meter (m) Units for intensity – watts per meters squared (W/m 2 ). Sound Intensity.

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ch 13

Ch. 13

Sound

sound intensity
Sound Intensity
  • Intensity – the rate of energy flow through a given area
slide3

Units for Power – watt (W)

  • Units for distance – meter (m)
  • Units for intensity – watts per meters squared (W/m2)
sound intensity1
Sound Intensity
  • Intensity and frequency determine which sounds are audible
  • Threshold of Hearing – softest sounds heard by humans
  • Threshold of Pain – loudest sounds human ears can tolerate
sound intensity2
Sound Intensity
  • Decibel level – relative intensity, measured in decibels (dB)
resonance
Resonance
  • Resonance – when the frequency of a force applied to an object matches the object’s natural frequency
human ear
Human Ear
  • The ear transmits vibrations that cause nerve impulses
slide12

What is the intensity of the sound waves produced by a trumpet at a distance of 3.2 m when the power output of the trumpet is 0.20 W?

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