An electron collides with a dfixed hydrogen atom in its ground stat. Hydrogen atom gets excited and the collding electron loses all its kinetic energy. Consequently the hydrgogen atom may emits a photon corresponding to the alrgest wavelength of the Balmer series. The K.E. of colliding electron will be 24.2/N eV. Find the value of N.

Answer

2

Explanation

Kinetic energy of electron `= 13.6 [1-1/9] eV = 12.1 eV`.