# physics

posted by maria

The sound level in decibels is typically expressed as β = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is β = 20 log (P/P0), where P0 is the smallest pressure difference noticeable by the ear: P0 = 2.00·10-5 Pa. A hair dryer has a sound level of 79 dB, find the amplitude of the pressure wave generated by this hair dryer?

1. Henry

Check your 11-16-11, 6:30am post for solution.

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