When a hydrogen atom emits a photon of energy 12.1eV, the orbital angular momentum changes by
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Emission of photon of 12.1eV corresponds to the transition from n=3 to n=1
∴ Change in angular momentum
=(n2−n1)h2π
=(3−1)h2π
=hπ
=6.626×10−343.14
=2.11×10−34JSec
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