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.

63.75eV

31.86eV

137.50eV

14.95eV

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