A concert loudspeaker suspended high off the ground emits 38 W of sound power. A

Question

A concert loudspeaker suspended high off the ground emits 38 W of sound power. A small microphone with a 1.0 cm2 area is 40 m from the speaker.
Part A What is the sound intensity at the position of the microphone?
Part B What is the sound intensity level at the position of the microphone?
A concert loudspeaker suspended high off the ground emits 38 W of sound power. A small microphone with a 1.0 cm2 area is 40 m from the speaker.
Part A What is the sound intensity at the position of the microphone?
Part B What is the sound intensity level at the position of the microphone?
A concert loudspeaker suspended high off the ground emits 38 W of sound power. A small microphone with a 1.0 cm2 area is 40 m from the speaker.
Part A What is the sound intensity at the position of the microphone? Part A What is the sound intensity at the position of the microphone?
Part B What is the sound intensity level at the position of the microphone? Part B What is the sound intensity level at the position of the microphone?

Explanation / Answer

a)

Intensity

I=P/4pir2=38/4pi*402

I=1.89*10-3 W/m2

b)

Sound intensity level in dB

B=10Log(I/Io)=10Log(1.89*10-3/10-12)

B=92.8 dB

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