Find how far away is he from the bird

Reference no: EM13532995

Abe and Bob are bird-watching, hoping to add a particular song bird to their "life list" of species. They agree to split up so they can cover a larger area. Abe hears the coveted bird's call with an intensity of 2.10 10-6 W/m2 when the bird is 2.03 m away from him.
(You may assume the bird call is of constant loudness, for simplicity's sake.)

a) How loud (in dB) is the bird call to Abe?

____dB

b) Bob is as far away as possible, such that he can still hear the bird. How far away is he from the bird?

____km

c) A typical surface area of an eardrum is 5·10^-5 m2. Using this value, calculate the total sound energy absorbed by each observer during a 4 s birdcall. (You may assume the call is directly incident on both pairs of ears.)

Abe:____J

Bob:____J

Reference no: EM13532995

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