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SOUND

SOUND. Part 3. SOUND. SOUND ENERGY, INTENSITY and POWER. The acoustic power of a sound source is the amount of sound energy produced by a source per second. Acoustic power is measured in Watts .

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SOUND

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  1. SOUND Part 3

  2. SOUND

  3. SOUND ENERGY, INTENSITY and POWER • The acoustic power of a sound source is the amount of sound energyproduced by a source per second. Acoustic power is measured in Watts. • Sound intensity [ I, Wm-2 ] is the rate at which sound energy passes through an area of 1 square metre. • The intensity of a sound varies inversely as the square of the distance from the source inverse square law.

  4. SOUND INTENSITY LEVELS • Humans can respond to sound intensities ranging from 1x10-12 Wm-2 [threshold of hearing] to 1.0 Wm-2[threshold of pain]. • This huge range in sound intensities is impractical for use in comparing the “loudness” of sounds, so a logarithmic scale was developed … the Bel scale • The sound intensity level is a comparison of the intensity of a sound to a reference intensity [threshold of hearing], measured in decibels (dB) http://www.animations.physics.unsw.edu.au/jw/dB.htm

  5. TYPICAL SOUNDS

  6. HUMAN HEARING http://www.youtube.com/watch?v=GGqfRvCkt-w&feature=related

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