JEE Main 2015PhysicsWave OpticsHardMCQ

JEE Main 2015 — Wave Optics Question with Solution

JEE Main 2015 (10 Apr Online)

Question

A parallel beam of electrons travelling in x - direction falls on a slit of width d (see figure). If after passing the slit, an electron acquires momentum py in the y - direction then for a majority of electrons passing through the slit (h is Planck's constant):

Choose an option

Show full solutionCorrect option: A
Correct answer
A | p y |d<h

Step-by-step explanation

The electron beam will be diffractive at an angle θ



For Ist minima

dsin⁡θ= λ

dsin⁡θ= hp

Also psin⁡θ=py

⇒    d py=h

∴ majority of electrons passing through the slit are lying in the central maxima d py <h

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About this question

This is a previous-year question from JEE Main 2015, covering the Wave Optics 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.