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An electron collides with a dfixed hydro...

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.

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