The energy difference between the orbitals can be calculated from bohr's model.
According to the bohr's model, the electrons are in continuous motion round the nucleus closed orbits of definite energy level. as the distance of the cell increases from the nucleus ,energy level of cell increases..as long as electron occupy a definite energy level, it doesn't radiate out energy. The emission of energy occurs only when electron jumps from one level to other.
E= h c/ λ
Sodium atom emit light with a wavelength of 330nm when an electron moves from a 4p orbital to a 3s orbital.
λ=330nm
h=6.625 .10-34 (Planck's constant)
c= 3.0 .108m/s-1
putting the values in the expression of Energy we get the energy difference.
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