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Question 17 Express the threshold of hearing (2.5 x 10-12 W/m2) and the threshold of pain (1.0 W/m2) in decibels. 4.0 dB & 1.
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Answer #1

formula sound intensity is

beta = 10 log ( I/Io)

for I = 2.5* 10^-12 W/m^2

beta = 10 log ( 2.5* 10^-12/1* 10^-12) = 4.0 dB

for I = 1 W/m^2

beta = 10 log ( 1/1* 10^-12) = 120 dB

4.0 dB&120 dB choice is correct

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