A source of sound waves is placed at the centre of a very large sound-reflecting wall. The source emits 0.500 W of power. Two metres from the source the intensity

A source of sound waves is placed at the centre of a very large sound-reflecting wall. The source emits 0.500 W of power. Two metres from the source the intensity in W/m2 is:
A)9.95  103.
B)1.99  102.
C)0.313.
D)0.399.
E)0.625.

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