An electron in `H` atom makes a transition from `n = 3 to n = 1`. The recoil momentum of the `H` atom will beA. `6.45 xx 10^(-27) N s`B. `6.8 xx 10^(-27) N s`C. `6.45 xx 10^(-24) N s`D. `6.8 xx 10^(-24) N s`

An electron in `H` atom makes a transition from `n = 3 to n = 1`. The

1.	An electron in `H` atom makes a transition from `n = 3 to n = 1`. The recoil momentum of the `H` atom will beA. `6.45 xx 10^(-27) N s`B. `6.8 xx 10^(-27) N s`C. `6.45 xx 10^(-24) N s`D. `6.8 xx 10^(-24) N s`
Answer» Correct Answer - A The recoil momentum of atom is same as that of photon but in opposite direction. hence recoil momentum: `P = (E)/( c) = (12.09 xx 1.6 xx 10^(-19))/(3 xx 10^(8) N s = 6.45 xx 10^(-27) N s` note that almost whole of the energy will be carried away by the photon because it is very light in comparoson to `H` atom.

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An electron in `H` atom makes a transition from `n = 3 to n = 1`. The recoil momentum of the `H` atom will beA. `6.45 xx 10^(-27) N s`B. `6.8 xx 10^(-27) N s`C. `6.45 xx 10^(-24) N s`D. `6.8 xx 10^(-24) N s`

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