JEE Main 2024PhysicsWaves and SoundEasyNumerical

JEE Main 2024 — Waves and Sound Question with Solution

JEE Main 2024 (30 Jan Shift 2)

Question

A point source is emitting sound waves of intensity 16×10-8 W m-2 at the origin. The difference in intensity (magnitude only) at two points located at a distances of 2 m and 4 m from the origin respectively will be ________×10-8 W m-2.

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Show full solutionCorrect answer: 3
Correct answer
3

Step-by-step explanation

Intensity for a point source varies as I∝1r2.

Intensity at a distance of 2 m, I2=16×10-8×122=4×10-8 W m-2

Similarly, intensity at a distance of 4 m, I4=16×10-8×142=1×10-8 W m-2

Required difference, I2-I4=3×10-8 W m-2

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About this question

This is a previous-year question from JEE Main 2024, covering the Waves and Sound chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.