Radial nodes are calculated as n - l - 1. For a 4f orbital, where n = 4 and l = 3, the number of radial nodes is:
4 - 3 - 1 = 1
Assertion (A): The potential energy of an electron revolving in any stationary orbit in a hydrogen atom is positive.
Reason (R): The total energy of a charged particle is always positive.
Which of the following represents the wavelength of spectral line of Balmer series of He$^+$ ion? (R = Rydberg constant, n $>$ 2)