JEE Main 2022PhysicsDual Nature of MatterEasyNumerical

JEE Main 2022 — Dual Nature of Matter Question with Solution

JEE Main 2022 (24 Jun Shift 1)

Question

When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is v1. When the frequency of incident radiation is increased to five times the threshold value, the maximum velocity of emitted electron becomes v2. If v2=xv1, the value of x will be _____ .

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Show full solutionCorrect answer: 2
Correct answer
2

Step-by-step explanation

Maximum kinetic energy is expressed as Kmax=hf-ϕ, here, ϕ is work function of metal.

For first case, 12mv12=h2f0−f0

For second case, 12mv22=h5f0−f0

⇒v22v12=41⇒v2v1=2

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About this question

This is a previous-year question from JEE Main 2022, 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.