MCQ practice · SSC Physics Board questions · Chapter 7: Waves and Sound
What is the unit of sound intensity?
Think it through first, then pick an option.
- a S
- b Hz
- c W
- d Wm⁻²
Answer and explanation
Correct answer: d Wm⁻²
Right. Intensity = power ÷ area = W ÷ m² = W m⁻².
Why the other options are wrong
- a S: S is the siemens, the unit of electrical conductance, not of intensity.
- b Hz: Hz is the unit of frequency. Frequency decides deep or shrill, not how strong the sound is.
- c W: W is the unit of power, the total energy each second. Intensity is taken per unit area, so it needs ÷ m².
More board questions on this topic
- The unit of sound intensity−
- Which is the unit of sound intensity?
- The unit of sound intensity is−
- The pitch of a musical sound:
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