Sound intensity: What is the correct physical unit for intensity of sound? Recall that intensity is acoustic power transmitted per unit area, not a subjective level measure. Choose the correct option.
IIT JEE
Physics
Difficulty: Easy
Choose an option
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AJoule (J)
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BPascal (N/m²)
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CWatt per square metre (W/m²)
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DDecibel (dB)
Answer
Correct Answer: Watt per square metre (W/m²)
Explanation
Concept & formulaIntensity I = Power/Area ⇒ SI unit W/m².
ClarificationDecibel (dB) is a logarithmic level (ratio) unit for intensity or pressure levels, not the base SI unit of intensity itself.
Final AnswerWatt per square metre (W/m²)