JEE Main 2019PhysicsDual Nature of MatterMediumMCQ

JEE Main 2019 — Dual Nature of Matter Question with Solution

JEE Main 2019 (08 Apr Shift 2)

Question

A nucleus A, with a finite de-broglie wavelength λA, undergoes spontaneous fission into two nuclei B and C of equal mass. B flies in the same direction as that of A, while C flies in the opposite direction with a velocity equal to half of that of B. The de-Broglie wavelengths λB  and λC of B and C are respectively:

Choose an option

Show full solutionCorrect option: B
Correct answer
BλA2,λA

Step-by-step explanation

hλA=hλB-hλC …(i)
Also λC=2λB ...(ii)
From equation (i) & (ii),
1λA=1λB-12λB
λB=λA2; λC=λA

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About this question

This is a previous-year question from JEE Main 2019, 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.