PreCalculas

The psychological sensation of loudness B is measured in decibels and is defined with reference to the intensity, , of a barely audible sound by the following equation. In this equation, I is the intensity of the sound in question.
B=10log 1/1o
If the sound of a jet engine during takeoff is 140 decibels and the sound of a rock concert is 115 decibels, how does the intensity of the sound of the jet engine compare to the intensity of the sound of the rock concert?
I got that the intensity of the concert would be louder...is this right?

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asked by Ryan
  1. check your typing
    your equation contains no l
    besides that, what is 1o ?

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    posted by Reiny
  2. im sorry the 1 is l and the zero is the lower exponet

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    posted by Ryan
  3. You mean I think:

    Db = 10 log (I/Io)

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    posted by Damon
  4. no, wrong. The higher the Db the louder

    140 = 10 log (Ijet/Io)
    115 = 10 log (Iband/Io)

    14-11.5 = log (Ijet/IIband)

    10^2.5 = Ijet/Iband = 316

    the jet intensity (power) is 316 times the rock concert

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    posted by Damon
  5. Thanks i see what i did wrong

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    posted by Ryan
  6. is it 21?

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