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Calculating radiated power of a firecracker

The explosion of the firecracker in the air at a height of 40m produces a 100 db sound level at the ground below. If the threshold of hearing is 10-12Wm-2, what is the instantaneous total radiated power, assuming that it radiates as a point source?

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level of sound :
L = 10*log(I/Io)
where Io = threshold intensity = 10^(-12) W/m^2 and I is the intensity of sound heard (here sound of fire ...

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