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Question

A microphone of cross-sectional area 0.80 cm2 is placed in front of a small speaker emitting 3.0 W of sound output. If the distance between the microphone and the speaker is 2.0 m, how much energy falls on the microphone in 5.0 s?

A

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B

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C

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D

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Solution

The correct option is C


powerArea for a sphere of radius 2m is 34π(2)2

Now to get power being received by microphone

316π × 0.80 × 104

Energy received in 5 sec

Energy = power × time

316π × 0.80 × 104 × 5

=0.238 × 104

=24 × 106J

=24 μ J


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