Question

Energy required to remove an e-from M shell of
H-atom is 1.51 eV, then energy of first excited
state will be :-
(1) -1.51 eV
(2) +1.51 eV
(3) -3.4 eV
(4) -13.6 eV
​

Answer 1

Answer:

using the formula -13.6/ n2 eV

-13.6/2^2 = -13.6/4

= -3.4 eV.