Calculate the wavelnght of radistions emertted producing a line in Lyman serices , wne an electron falls from fourth stationargy state in hydrogen atom . `( R_H = 12 xx 10^7 m^(-1))`.

Explanation

We know ,
` 1/(lambda) = R_H [ 1/n_1^2 - 1/n_2^2]`
Given ` R_H = 1.2. xx 10 ^7 , ` for lyman series ` n_1 =1` and ` n-02 =- 4` (given )
` :. 1/( lambda) = 1.1 xx 10^7 [1/1^2 - 1/4^2]`
` :. lambda = 0. 9696 xx 10^(-7) ` metre.