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The threshold of hearing at 1000 Hz is given as$1\times { 10 }^{ -12 }\cfrac { W }{ { m }^{ 2 } }$. Suppose you and four friends happen upon a very quiet source point of sound radiating uniformly in all directions. You measure the power of the sound waves to be $32\pi \times { 10 }^{ -12 }W$ and the frequency to be a $1000$ $Hz$ pure tone. If each of you stand a meter further away from the source point of sound, which person or persons would be in the audible range of hearing?

Select ALL that apply.

A

A

B

B

C

C

D

D

E

E

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