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An H atom in ground state is moving with...

An `H` atom in ground state is moving with initial kinetic energy `K` .It collides head on with `He ^(+)` ion in ground state kept at rest but free to move. Find minimum value of `K` so that both the particles can excite to their first excited state.

Text Solution

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Energy available for excitation `=(4K)/(5)`
Total energy required for excitation
`=10.2 ev+40.8 evV`
`=51.0 ev`
`:. (4k)/(5)=51 rArrk=63.75 eV`
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