The SI unit for intensity of sound is:
Correct answer: B. Watt per metre square
- A. Joule per second
- B. Watt per metre square
- C. Watt metre square
- D. Joule per metre square
- E. Joule metre
Explanation
Intensity is the amount of sound power passing through a unit area, and is measured in watts per square meter (W/m²). The correct answer is Option B: Watt per metre square. Other options do not represent intensity: Option A, Joule per second, measures power; Option C, Watt metre square, is not a recognized unit; Option D, Joule per metre square, measures energy density; and Option E, Joule metre, is not a standard physical unit.
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About Waves
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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