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Homework Help: Intensity of sound wave when given sound intensity level.

  1. Feb 7, 2010 #1
    1. The problem statement, all variables and given/known data

    What is the intensity of sound wave with sound intensity level 34 dB?

    2. Relevant equations

    B = (10dB) log (I/Io) B = sound intensity level, I = intensity, Io= 1.0x10^-12 W/m^2

    3. The attempt at a solution

    I figured it would be simply a matter of rearranging the equation above to solve for I and entering all the values giving:

    I = Io x 10^(B/10 dB)
    I = (1.0x10^-12) x 10^(34/10)
    I = 2.0x10^-9 W/m^2

    However the assignment tells me that I am wrong. Am I missing something very very basic? Am I using the wrong equation all together? My textbook won't tell me, so I've turned to Physics Forums. :uhh:
  2. jcsd
  3. Feb 7, 2010 #2


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    Homework Helper

    Recalculate 10^3.4.

  4. Feb 7, 2010 #3
    My calculator decided to cut off a 5 after the 2. *sigh*. Thanks.
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