The gyromagnetic ratio of an electron in an hydrogen atom, according to Bohr model is

The electron in hydrogen atom is initially in the third excited state. When it finally moves to ground state, the maximum number of spectral lines emitted are

If the electron in a hydrogen atom moves from ground state orbit to 5^th orbit, then the potential energy of the electron

Using Bohr's quantisation condition, what is the rotational energy in the second orbit for a diatomic molecule? ($$I=$$ moment of inertia of diatomic molecule and, $$h=$$ Planck's constant)