JEE Main 2022PhysicsDual Nature of MatterEasyMCQ

JEE Main 2022 — Dual Nature of Matter Question with Solution

JEE Main 2022 (29 Jun Shift 2)

Question

The electric field at a point associated with a light wave is given by
E=200sin6×1015t+sin9×1015t Vm-1

Given: h=4.14×10-15 eVs

If this light falls on a metal surface having a work function of 2.50 eV, the maximum kinetic energy of the photoelectrons will be

Choose an option

Show full solutionCorrect option: D
Correct answer
D3.42 eV

Step-by-step explanation

Given: E=200sin6×1015t+sin9×1015t V m-1

Here, angular velocity, ω1=6×1015 and ω2=9×1015

Maximum kinetic energy of the photoelectron is KEmax.=E-ϕ

=hf-ϕ=hω2π-ϕ

=4.14×10-15×9×10152×3.14-2.5=5.92-2.50=3.42 eV

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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.