Physics XII Content
When electrons moves around the nucleus in certain permitted orbit, it can jump from higher to the lower energy level with the emission of radiation. The wavelength of emitted radiation can be obtained by the expression:
Where R2= Rydberg constant
n1= lower energy level
n2 = higher energy level
On the basis of transition of electron from higher to lower energy level different spectral series can be obtained which are explained below
If the transition of electron is to n1= 1 from n2 = 2,3,4…. Lyman series can be obtained. The wavelength of the layman series can be obtained as:
The wavelength lies in the region of the ultraviolet.
If the transition of electron is to n1=2 from n2 = 3,4,5… balmer series is obtained. The wave length of balmer series can be obtained as
The wavelength lies in the visible region.