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When a photon having energy 10.2 eV is absorbed by Li^++ ion then find change in angular momentum

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When a photon having energy 10.2 eV is absorbed by Li++ ion then find change in angular momentum

(1) h/2π

(2) 2h/2π

(3) 3h/2π

(4) zero

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Correct option is (3) 3h/2π

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