The hydrogen atom makes a transition form \( \mathrm{n}=4 \) to \( \mathrm{n}=1 \) state. Then t....

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The hydrogen atom makes a transition form \( \mathrm{n}=4 \) to
\( \mathrm{P} \)
\( \mathrm{n}=1 \) state. Then the recoil momentum of \( \mathrm{H} \)-atom is
W
units of \( (\mathrm{eV} / \mathrm{C}) \) is given
(1) 13.60
(2) 12.75
(3) 0.85
(4) 22.1


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