Explanation The loudness L, measured in decibels, of a sound of intensity x , measured in watts per square meter is L ( x ) = 10 log x 10 − 12 . Note that, an MP3 player has an intensity level of 10 − 2 watt per square meter. Substitute x = 10 − 2 in L ( x ) = 10 log x 10 − 12 , L ( 10 − 2 ) = 10 log 10 − 2 10 − 12 = 10 log 10 − 2 + 12 ( ∵ laws of exponents; a m a n = a m − n )

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ISBN: 9780134556079

Author: Sullivan, Michael, III, Struve, Katherine R., Mazzarella, Janet.

Publisher: Pearson,

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Chapter 11.3, Problem 22E

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