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The radiations obtained from deexcitation of H-atom from second orbit to 1st, striked on a metal of work function ϕ 4.2 eV. The wavelength (in Ao) of ejected electron having maximum kinetic energy is:

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answer is 5.

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Detailed Solution

E2−1=10.2eV;W=4.2eVE=4.2+KE∴ 10.2=4.2+KE ∴ KEmax=6eV12mu2=KEor λ=150KE=1506=5Å

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