Question

If transition of an electron in H atom takes place from 3rd orbit to 5th orbit then change in angular momentum of electron is given by

Answer 1

answer : h/π

explanation : according to Bohr's model of atom, angular momentum of an electron in an orbit is integral multiple of h/2π

so, angular momentum of electron in nth orbit = nh/2π

then, angular momentum in 3rd orbit = 3h/2π

angular momentum in 5th orbit = 5h/2π

so, change in angular momentum = (5h - 3h)/2π = 2h/2π = h/π

hence, change in angular momentum of electron is given by h/π