1.

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 beA. 10.2 eVB. 1.9 eVC. 12.1 eVD. 13.6 eV

Answer» Correct Answer - B


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