AIPMT PRELIMS2005Physics-Waves
AIPMT PRELIMS 2005 Physics Sound Intensity MCQ Question
Type: MCQ-conceptual-Easy-Class 11
A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is:
A
9 : 4
B
2 : 9
C
9 : 2
D
4 : 9
Correct Answer
Option A
Detailed Explanation
Intensity is inversely proportional to the square of the distance from the source. Therefore, I₁/I₂ = (r₂/r₁)² = (3/2)² = 9/4.
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