JEE Main 2016ChemistryStructure of AtomHardMCQ

JEE Main 2016 — Structure of Atom Question with Solution

JEE Main 2016 (03 Apr)

Question

A stream of electrons from a heat filament was passed between two charge plates kept at a potential difference V esu. If e and  m are charge and mass of an electron, respectively, then the value of hλ (where λ is wavelength associated with the electron wave) is given by:

Choose an option

Show full solutionCorrect option: B
Correct answer
B2 meV

Step-by-step explanation

Given, stream of electron from heated filament was passed between two charge plates at potential difference V.
e and m are charge and mass of electron, respectively.
V=Energye
eV=12×m×v2
λ=hmv   v=hmλ
eV=12×m×hmλ2
hλ=2 meV 

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About this question

This is a previous-year question from JEE Main 2016, covering the Structure of Atom chapter of Chemistry. 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.