Two people relaxing on a deck are disturbed by the croak of a raven. One person,

Question

Two people relaxing on a deck are disturbed by the croak of a raven. One person, only 1.00 m from the bird, hears the sound with an intensity of 8.0 times 10^-4 W/m^2. (a) What intensity is heard by the second person, who is 4.25 m from the raven? (b) Assume that no reflected sound is heard by either person, what is the power output of the raven's croak? (c) What is the intensity level received by each person? (d) How many similar ravens should croak simultaneously in the same tree for the intensity level received by the first person to increase by 15 dB? (e) How far should the first person be from the raven for the croak to be barely detectable?

Explanation / Answer

(e)The faintest sound that the typical human ear can detect has an intensity of 1*10-12 W/m^2

so I=10^(-12)

power=1.005*10^(-4)

I=power/4*pi*r^2

we got r=2828.4 m

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