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How many times more intense is a 90-dB s...

How many times more intense is a 90-dB sound than a 40-dB sound?

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`:. I_(1)= 40 dB = 10^(-8) W m^(-2)`
`I_2 = 90 dB = 10^(-3) W m^(-2)`
`:. (I_2)/(I_(1))=10^5`
`I_2=10^5 I_(1)`
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