JEE Main 2018ChemistryStructure of AtomMediumMCQ

JEE Main 2018 — Structure of Atom Question with Solution

JEE Main 2018 (15 Apr)

Question

Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0.5 V, when the radiation of 250 nm is used. The work function of the metal is

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Show full solutionCorrect option: C
Correct answer
C4.5 eV

Step-by-step explanation

λ=250 nm=2500 A 

E=hcλ=124002500=4.96 eV

KE=e×stopping potential=0.5 eV

E=W0+KE

4.96=Wo + 0.5

W0=4.46≈4.5 eV

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About this question

This is a previous-year question from JEE Main 2018, 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.