Q.

For hydrogen atom, energy of an electron in first excited state is -3.4 eV, K.E. of the same electron of hydrogen atom is x eV. Value of x is _________ ×10-1 eV. (Nearest integer)                  [2024]


Ans.

(34)               For an electron present in a single electron species in any of the orbits,

                      Total energy : kinetic energy : potential energy = -1 : +1 : -2

                       Thus if total energy is -3.4 eV, then kinetic energy is +3.4 eV = 34×10-1 eV.