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An electron collides with a fixed hydrog...

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 corresponding to the largest wavelength of the Balmer series. The K.E. of colliding electron will be

A

10.2 eV

B

1.9 eV

C

12.1 eV

D

13.6 eV

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The correct Answer is:
B
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