A speaker is sending out 144.00J of energy over a time of 6.00s. The sound is tr

Question

A speaker is sending out 144.00J of energy over a time of 6.00s. The sound is traveling out in all directions. What is the power being emitted by the speaker?

What is the intensity of the sound at a distance 6.0m away from the speaker? (remember that units of intensity are W/m2. These are entered as W/m^2.)

What is the intensity of the sound at a distance 12.0m away from the speaker? (Think about how this compares with the previous distance.)

What is the intensity of the sound at a distance 18.0m away from the speaker? (See the pattern?)

What is the intensity of the sound at a distance 15.0m away from the speaker?

Explanation / Answer

P = E/t = 144/6 = 24 W

I = P/A = 24/(4*pi*6^2)= 0.053

I = 24/(4*pi*12^2) = 0.0133

I = 24/(4*pi*18^2) = 0.00589

I = 24/(4*pi*15^2) = 0.00849

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