Part A)
Start with B = 10logI/Io
101 = 10log(I/1 X 10^-12)
I = 0.013 W/m^2
I = P/A
P = IA
P = (0.013)(4pi)(153)^2
P = 3824.16 Watts
Part B)
The minimum intensity = 1 X 10^-12
I = P/A
A = P/I = 3824.16/1 X 10^-12
A = 3.824 X 10^15 m^2
A = 4pir^2
3.824 X 10^15 = 4pir^2
r = 1.74 X 10^7 m
A weather emergency siren is mounted on a tower, 153 meters above the ground. On one...
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