Question

de-Broglie wavelength of electron in second orbit of
Li 2+ ?' ion will be equal to de-Broglie of wavelength of
electron in
(A) n=3 of H-atom
(B) n=4 of C5+ ion
(C)n=6 of Be3+ ion
(D) n=3 of He+ ion​

Answer 1

option is b...............