When the electron jumps from a level n = 4 to n = 1 the momentum of recoiled hydrogen atom will be

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6.5×10−27 kgms−1

12.75×10−19 kgms−1

13.6×10−19 kgms−1

Zero

answer is A.

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Detailed Solution

13.6112−142=hvMomentum of photon = hνc = momentum of atom.13.6×1.6×10−19893×108=p=6.5×10−27kgms−1

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