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# sum_lecture07 - The Physics of Light Sound Sound Waves the...

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Click to edit Master subtitle style 6/2/11 The Physics of Light & Sound Sound Waves & the Speed of Sound Drs. Paulson and Scully

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6/2/11 The speed of sound within a medium generally depends on the stiffness of the medium and the density of the medium. The speed of sound in air also depends on the temperature (in Celsius) as: Speed of Sound s m T c c / 6 . 0 331 + =
6/2/11 Density & Pressure Sound waves are density waves or pressure waves. Well, what’s density? Density is the amount of matter packed in per volume. This is not the same as mass! It is mass per unit volume. Water is 1000 kg/m3. Metals would range from 5000 - 12,000 kg/m3. Rock is generally around 3000 kg/m3. 3 m kg V m = = ρ

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6/2/11 Sound Waves Sound waves are longitudinal pressure or density waves that produce rarefactions and compressions . Compressio n Rarefactio n
6/2/11 Sound Pressure Pressure was defined to be the force applied per unit area: P = F A The unit of pressure would therefore be N/m2 or a Pascal (Pa). Atmospheric pressure is around 105 Pa Sound pressure is the difference between the actual instantaneous pressure due to sound and the atmospheric pressure. Sounds generally vary from 2x10-5 Pa to a few thousand pascal.

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