What will be the angular momentum in 6^th orbit if l is the angular momentum of the electron in the 3^rd orbit of hydrogen atom?

2l

The angular momentum of n^th orbit is given by

L_n = mv_nr_n = nh/2π

The angular momentum of third orbit (L₃) = 3h/2π = l

The angular momentum of sixth orbit (L₆) = 6h/2π = 2(3h/2π)

L₆ = 2l

So, the correct option is (c).