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A sound source is generating 180 W of sound energy in all directions. A person is...

A sound source is generating 180 W of sound energy in all directions. A person is moving toward the source at 0.40 m/s. When he is 50 m away,

a. What is the intensity of sound in dB?

b. What is the rate at which the intensity of sound is increasing in dB/s?

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Answer #1

when the observer is moving, the observed frequency is

taking V=340m/s

N2 = ((340.4)/340)N1

Since Power P = K N2  

Hence power

Now Intensity I = Power/ Area

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