Please help... If the power output of a sound source emitting spherical waves is

Question

Please help...
If the power output of a sound source emitting spherical waves is100W, the sound intensity 5.0m from the source is:
A) 0.32 W/m2 B) 1.6 W/m2 C) 4.0 W/m2 D) 20 W/m2 E) 100 W/m2
Can someone please explain the question and howto do it. I'm struggling. Thanks so much, I will absolutely rate!
Please help...

A) 0.32 W/m2 B) 1.6 W/m2 C) 4.0 W/m2 D) 20 W/m2 E) 100 W/m2
Can someone please explain the question and howto do it. I'm struggling. Thanks so much, I will absolutely rate! Can someone please explain the question and howto do it. I'm struggling. Thanks so much, I will absolutely rate!

Explanation / Answer

intensity = power output / area of sphere = P / 4 r2 = .    = 100 / 4 52=    0.32W/m2

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