Chap20_Sound - Chapter 20 Sound Nature of Sound Sound is a...

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Chapter 20 Sound
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Nature of Sound Sound is a wave that is produced by the vibrations of material objects. Tuning fork Guitar string Drumhead
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Nature of Sound in Air Sound in air is a longitudinal wave created by compressions and rarefactions.
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Media which Transmit Sound Sound travels better through elastic liquids and solids, such as water and rocks, than through air. This is due to the close proximity of the atoms as they vibrate. Hear richer, louder sound transmitted by string
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Loudness depends on amplitude of pressure and density variations in sound waves.
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Loudness of sound depends on the amplitude of pressure variations in the sound waves. Loudness is measured in decibels (dB), it is a logarithmic scale as our perception of loudness varies logarithmically. From the threshold of hearing (0 dB) to the threshold of pain (120 dB) the pressure increase is a million times higher. At the threshold of pain (120
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This note was uploaded on 04/29/2010 for the course PHYS 100 taught by Professor Nidhalguessoum during the Spring '10 term at American University of Sharjah.

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Chap20_Sound - Chapter 20 Sound Nature of Sound Sound is a...

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