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MHT CET 2026 (19 May, Shift 1) · Wave Basics & Properties of Sound

Wave Basics & Properties of Sound question from MHT CET 2026 (19 May, Shift 1)

Q9MHT CET 2026 · 19 MAY · SHIFT 1Easy

Wave Basics & Properties of Sound

The amplitude of a sound wave at a distance $r$ from a point source is $A$ . The amplitude at a distance $2r$ from the point source is

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Answer: (b)

For a point source, $I = \frac{P}{4\pi r^2} \propto \frac{1}{r^2}$ .
Also $I \propto A^2$ , so $A \propto \frac{1}{r}$ .
At $2r$ : $A' = \frac{A}{2}$
So the answer is (b) $\frac{A}{2}$ .

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