JEE Main 2023PhysicsDual Nature of MatterMediumNumerical

JEE Main 2023 — Dual Nature of Matter Question with Solution

JEE Main 2023 (30 Jan Shift 1)

Question

A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of 24 W. The radius of curvature of hemisphere is 10 cm and the inner surface is completely reflecting. The force on the hemisphere due to the light falling on it is ______ ×10-8 N.

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Show full solutionCorrect answer: 4
Correct answer
4

Step-by-step explanation

For completely reflecting surface, force, F=2IAc, where, I=PSurface area is intensity of radiation, A is surface area and c is speed of light.

F=2IcπR2=2P04πR2πR2c

=P02c=242×3×108=4×10-8 N

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About this question

This is a previous-year question from JEE Main 2023, covering the Dual Nature of Matter 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.