Homework Answers
1.
as we know
B = 10 log ( I/ 10^-12)
75/ 10 = log (I/10^-12)
I = 3.162* 10^-5 W/m^2
======
2.
new intensity
I' = 3 * I = 3* 3.162* 10^-5
I' = 9.4868* 10^-5 W/m^2
sound level
B' = 10 log ( I' / 10^-12)
B' = 10 log ( 9.4868* 10^-5 / 10^-12)
B' = 79.771 dB
=======
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