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An isolated hydrogen atom emits a photon...

An isolated hydrogen atom emits a photon of `10.2 eV`.
(i) Determine the momentum of photon emitted (ii) Calculated the recoll momenium of the atom
(ii) Find the kinetic energy of the recoll atom [Mass of proton `= m_(0) = 1.67 xx 10^(-27) kg`]

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