JEE Main 2020PhysicsDual Nature of MatterEasyMCQ

JEE Main 2020 — Dual Nature of Matter Question with Solution

JEE Main 2020 (09 Jan Shift 1)

Question

A particle moving with kinetic energy E has de Broglie wavelength λ . If energy ΔE is added to its energy, the wavelength become λ2 . Value of ΔE, is:

Choose an option

Show full solutionCorrect option: C
Correct answer
C3E

Step-by-step explanation

λ=h2KEm⇒λ∝1KE
λλ2=KEfKEi
4KEi=KEf
⇒ΔE=4KEi-KEi=3KE=3E

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About this question

This is a previous-year question from JEE Main 2020, 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.