JEE Main 2016 — Structure Of Atom Question with Solution
From: JEE Main 2016 (Offline)
Question
A stream of electrons from a heated filament was passed between two charged plates kept at a potential
difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h / (where
is wavelength associated with electron wave) is given by :
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
We know, Kinetic Energy (KE) =
mv2 = 2KE
m2v2 = 2mKE
mv =
For an electron of charge 'e' which is passes through 'V' volt, kinetic energy of electron will be
KE = eV
m =
We know de-Broglie wavelength for an electron =
= mv =
mv2 = 2KE
m2v2 = 2mKE
mv =
For an electron of charge 'e' which is passes through 'V' volt, kinetic energy of electron will be
KE = eV
m =
We know de-Broglie wavelength for an electron =
= mv =
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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.