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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 emits 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`

Text Solution

Verified by Experts

The correct Answer is:
C
Excitation upto `n=3` is required so that visible length is emitted upon de-excitation.
So required energy `=13.6 (1-1/9)=12.1 eV`
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