Please Help! The intensity in normal conversation, when about 50 cm cm from the

Question

Please Help! The intensity in normal conversation, when about 50 cm cm from the speaker, is about 310?6W/m2 3 x10^-6 W/m^2. Part A: Assume the sound spreads roughly uniformly over a sphere centered on the mouth. Estimate the power output of sound from a person speaking in normal conversation. Express your answer to two significant figures and include the appropriate units. Part B: How many people would it take to produce a total sound output of 65W W of ordinary conversation? [Hint: Add intensities, not dB dB's.] Express your answer using two significant figures.

Explanation / Answer

Power = intensity * area = I * (4*pi*r^2)

P = 3e-6*(4*3.14*0.5*0.5)

P = 9.42e-6 W

P1 =I1*A

I1 = P1/A

I1 = 65/(4*3.14*0.5*0.5) = 20.7

I1 = N*I

N = I1/I = 6.8*10^6

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