1.

Calculate how many times more intense is 90 dB sound compared to 40 dB sound?

Answer»

Solution :Given DATA: `L=log(I)/(I_(0))=logI-logI_(0)`
We get`90 dB = 9B=logI_(1)-logI_(0)`...(1)
`40dB=4B=logI_(2)-logI_(0)`...(2)
Subtract (2) from (1)
`-50dB=5B=logI_(1)-logI_(2)`
`5=log_(10)((I_(1))/(I_(2)))`
`(I_(1))/(I_(2))=10^(5)`


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