# 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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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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