<PRE><B>Question 138446</B>
The loudness of a sound in decibels is related to the sound i, where the function for the loudness is given L(i) = 10 log10 [(_i_)/io]
 and io is a constant equal to the minimum sound that can be detected by the human ear.
 Find the loudness in decibels of a recording of rock music with intensity 10 million times io.
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L(10^7 io) = 10log10(10^7io/io)

= 10log10 10^7 = 10*7 = 70dB
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Cheers,
Stan H.</PRE>