Question

A firecracker explodes near Angie, and the sound level that she hears is 95 dB. If the power of the sound emitted by the firecracker is 0.3 W, and the sound radiates equally in all directions from the firecracker, how far is Angie from the firecracker when it explodes? assume that the sound is distributed equally over the surface area of a sphere, 4pir^2.

Answer 1

Power of the sound emitted from the firecracker = P = 0.3 W

Sound level heard by Angie = = 95 dB

Sound intensity heard by Angie = I

I = 3.162 x 10^-3 W/m²

Distance of the Angie from the firecracker when it exploded = R

The sound in equally distributed in all directions that is in a spherical manner.

R = 2.75 m

Distance of Angie from the firecracker when it explodes = 2.75 m