At a rock concert, a dB meter registered 126dB when placed 2.7m in front of a loudspeaker on the stage. The intensity of the reference level required to determine the sound level is 1.0*10^-12 W/m^2.
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4) a) 126 = 1o*log(I/Io)
I = 3.98 W/m^2
Pout = T*A = 3.98*4*pi*r^2 = 3.98*4*3.14*2.7^2 = 364.418352 watt
b) 126/85 = log(r2/r1) = log(r2/2.7)
r2 = 81.98 m
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