An electron collides with a fixed hydrogen atom in its ground state. Hydrogen atom gets excited ...

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An electron collides with a fixed hydrogen atom in its ground state. Hydrogen atom gets excited and the colliding electron loses all its kinetic energy. Consequently the hydrogen atom may emit a photon
\( \mathrm{P} \) corresponding to the largest wavelength of the Balmer series. The min. K.E.of colliding electron will be
(A) \( 10.2 \mathrm{eV} \)
(B) \( 1.9 \mathrm{eV} \)
(C) \( 12.1 \mathrm{eV} \)
(D) \( 13.6 \mathrm{eV} \)
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