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Homework Help: Sound Intensity Level

  1. Dec 10, 2007 #1
    1. The problem statement, all variables and given/known data

    During a rehearsal, all eight members of the first violin section of an orchestra play a very soft passage. The sound intensity level at a certain point in the concert hall is 32.0 dB. What is the sound intensity level at the same point if only one of the violinists plays the same passage?
    [Hint: When playing together, the violins are incoherent sources of sound.]
    ____ dB

    2. Relevant equations


    3. The attempt at a solution

    Shouldnt this answer be around 40 something? If not any help would be awesome
  2. jcsd
  3. Dec 10, 2007 #2


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    Homework Helper

    Look up the equation for sound pressure addition for incoherent sources. The total pressure is the sum of the squares of the individual sources.

    You can convert from the linear scale to dB scale using the good old "10 log x".
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