What is the ratio of wavelength of (II) line fo Balmer series and (I) line fo Lyman seies ?

Answer

4

Explanation

For (II) line of Balmer seres ` N_1 = 2 , n_2 =4`
` :. 1/( lambda_(2B)) = R_H xx [1/2^2- 1/4^2]`
` = R_H xx 3/(16) `…(1)
For (I) line fo Lyman series ` n_1 = 1, n-2 =2`
` :. 1/( lambda_(1l) = R_H xx [1/1^2 -1/2^2]= R_H xx 3/4` …..(2)
by eqs , (1) and (2) ltbRgt ` ( lambda_(2B))/( lambda 1L) = (R_H xx 3 xx 16)/( 4 xx 3xx R_H) = 4`.