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Q.

The SI unit of sound intensity is:

 A.

Watt per square metre

 B.

Watt per metre

 C.

Watt per second

 D.

None

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Solution:
Option(A) is correct

The SI unit of sound intensity is the watt per square metre.

Sound intensity is not the same physical quantity as sound pressure. Hearing is directly sensitive to sound pressure which is related to sound intensity.

 In consumer audio electronics, the level differences are called "intensity" differences, but sound intensity is a specifically defined quantity and cannot be sensed by a simple microphone.


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