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Math Help - Alexander Graham Bell Problem

  1. #1
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    Alexander Graham Bell Problem

    The loudness of sound is measured in decibels in honor of Alexander Graham Bell (1847-1922), inventor of the telephone. If the variation in pressure is P pounds per square inch, then the loudness L in decibels is  L = 20 \log_{10}(121.3 P)

    Find the variation in pressure caused by a rock band at 115 decibels.
    i have no clue on how to start this one.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by viet View Post
    i have no clue on how to start this one.
    you start by substituting 115 for L of course, then solve for P. do you have problems solving the logarithmic equation?
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  3. #3
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    i seem to make it harder than it really is. thanks Jhevon
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