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..

`10.2 eV`

`1.9 eV`

`12.1 eV`

`13.6 eV`

Verified by Experts

The correct Answer is:

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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To excite the hydrogen atom from its ground state to second excited state…. eV energy is required.

3.4

12.09

10.2

13.6

`(E)/(4)`

`(E)/(2)`

its kinetic energy increases but potential and total energy decreases

kinetic energy, potential energy and total energy decrease.

kinetic energy decreases, potential energy increases but total energy remain same.

kinetic energy and total energy decreases but potential energy increases.