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NEET 2005 (AIPMT) · Wave Basics & Properties of Sound

Wave Basics & Properties of Sound question from NEET 2005 (AIPMT)

Q38NEET 2005 · AIPMTEasy

Wave Basics & Properties of Sound

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is

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Answer: (c)

For a point source, $I \propto \frac{1}{r^2}$ .
$\frac{I_P}{I_Q} = \frac{r_Q^2}{r_P^2} = \frac{9}{4}$
So the answer is (c) 9 : 4.

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