JEE Main 2020ChemistryStructure of AtomMediumNumerical

JEE Main 2020 — Structure of Atom Question with Solution

JEE Main 2020 (02 Sep Shift 2)

Question

The work function of sodium metal is 4.41×10-19J. If photons of wavelength 300 nm are incident on the metal, the kinetics energy of the ejected electrons will be h=6.63×10-34J s; c=3×108  m s-1__________×10-21J

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Show full solutionCorrect answer: 222
Correct answer
222

Step-by-step explanation

E=E0+(kE)max
hCλ=4.41×10-19+kE
6.63×10-34×3×108300×10-9=4.41×10-19+kE
So, KEmax=6.63×10-19-4.41×10-19

=2.22×10-19

=222×10-21J

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About this question

This is a previous-year question from JEE Main 2020, 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.