JEE Main 2015ChemistryStructure of AtomMediumMCQ

JEE Main 2015 — Structure of Atom Question with Solution

JEE Main 2015 (11 Apr Online)

Question

At temperature T, the average kinetic energy of any particle is 32kT. The de Broglie wavelength follows the order:

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Show full solutionCorrect option: A
Correct answer
AVisible photon>thermal electron>thermal neutron.

Step-by-step explanation

λn=h2mE
(E=kT for thermal neutron)
λn=h2mnkT=30.835T=30.83517.32=1.78 Å
λe=150V
Kinetic energy for electron in hydrogen atom =13.60 eV V=13.6 V
λe=15013.6=3.32 Å
λphotonvisible range=6000 Å
λphoton>λelectron>λneutron

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About this question

This is a previous-year question from JEE Main 2015, 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.