A sound wave radiates from a source in all directions.If the power of the sound source is 200 watts,then the intensity level of the sound wave 1000 m from the source is (in dB)
A) 62.8.
B) 66.0.
C) 68.5.
D) 70.5.
E) 72.0.

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The Answer of A sound wave radiates from a source in all directions.If the power of the sound source is 200 watts,then the intensity level of the sound wave 1000 m from the source is (in dB)
A) 62.8.
B) 66.0.
C) 68.5.
D) 70.5.
E) 72.0.

A Sound Wave Radiates from a Source in All Directions