MCQ practice · SSC Physics Board questions · Chapter 7: Waves and Sound
Which is the unit of sound intensity?
Think it through first, then pick an option.
- a Hz
- b Wm⁻²
- c m
- d ms⁻¹
Answer and explanation
Correct answer: b Wm⁻²
Right. Intensity = power ÷ area = W m⁻².
Why the other options are wrong
- a Hz: Hz is the unit of frequency. Intensity is a flow of energy, not a frequency.
- c m: m is the unit of length, as for wavelength. Not of intensity.
- d ms⁻¹: m s⁻¹ is the unit of speed, as for the speed of sound. Not of intensity.
More board questions on this topic
- The pitch of a musical sound:
- What kind of wave is sound?
- In which of the following media is the speed of sound the lowest?
- A sound of frequency 2 kHz travels through an iron pipe at a speed of…
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