JEE Main 2021PhysicsDual Nature of MatterMediumMCQ

JEE Main 2021 — Dual Nature of Matter Question with Solution

JEE Main 2021 (25 Jul Shift 2)

Question

An electron moving with speed v and a photon moving with speed c, have the same D-Broglie wavelength. The ratio of the kinetic energy of the electron to that of a photon is:

Choose an option

Show full solutionCorrect option: C
Correct answer
Cv2c

Step-by-step explanation

λe=λPh

hpe=hpph

2mke=Ephc

2mke=Eph2c2

keEph=Ephc212 m

=pphc12 m

=pec12 m

=mvc12 m

=v2c

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About this question

This is a previous-year question from JEE Main 2021, 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.