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NTA Abhyas JEE Main2020ChemistryStructure of AtomPractice

In a sample of excited hydrogen atoms, electrons make transition from n = 2 to n = 1 . Emitted quanta strike on a metal of work function ϕ 4.2 ev. Calculate the wavelength (in Å ) associated with ejected electrons having maximum kinetic energy.

Correct answer

5

Step-by-step solution

E = ϕ + K E 10.2 = 4.2 + K E λ e − = 150 6 = 5   A o

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