JEE Main 2023PhysicsDual Nature of MatterMediumMCQ

JEE Main 2023 — Dual Nature of Matter Question with Solution

JEE Main 2023 (30 Jan Shift 1)

Question

A small object at rest, absorbs a light pulse of power 20 mW and duration 300 ns. Assuming speed of light as 3 × 108 m s-1. The momentum of the object becomes equal to :

Choose an option

Show full solutionCorrect option: B
Correct answer
B2×10-17 kg m s-1

Step-by-step explanation

Momentum p=EnergyESpeed of lightc

=Power×timec

=20×10-3W300×10-9s3×108 m s-1

=2×10-17 kg m s-1

As momentum is conserved, therefore momentum of object will be 2×10-17 kg m s-1.

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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.