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Problems with dB

  1. Nov 15, 2006 #1
    'The intensity level of sound in a factory is 93.0 dB when all seven of its machines are working. If four machines are shut down for maintenance, what is the intensity level of the sound from the remaining machines? Assume that all seven machines are identical.'

    I know the answer is not just 3/7*93 as dB are similar to the richter scale. I found this and am trying to apply the third formula under 'Defintion' but to little success. I'm very confused.

    Could anyone explain a little clearer exactly what the dB is?
     
  2. jcsd
  3. Nov 15, 2006 #2

    HallsofIvy

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    Reverse your formula: all 7 machines are 7/3 as loud as only 3 so you must have 93.0= 10log((7/3)X) where X is the intensity of 3 machines.
     
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