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Ch. 13

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

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  1. Ch. 13 Sound

  2. Sound Intensity • Intensity – the rate of energy flow through a given area

  3. Units for Power – watt (W) • Units for distance – meter (m) • Units for intensity – watts per meters squared (W/m2)

  4. 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

  5. Sound Intensity • Decibel level – relative intensity, measured in decibels (dB)

  6. Resonance • Resonance – when the frequency of a force applied to an object matches the object’s natural frequency

  7. Tacoma Narrows Bridge Collapse

  8. Human Ear • The ear transmits vibrations that cause nerve impulses

  9. 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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