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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



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


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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