Neils Bohr was the first to explain quantitatively the general features of hydrogen atom structure and its spectrum. Calculate the wave number of radiation due to transition of an electron from fourth orbit to second orbit `(R_h=109677cm^-1)`

Explanation

`_V^-=R_H[1/(n_1^2)-1/n_2^1]=109677[1/2^2-1/4^2]=109677xx3/16=2.05xx10^6m^(-1)`