The ratio of the wavelength of the last line of Balmer series and the last line of Lyman series is :

Options

A. `2.5 :1`
B. `3.5 :1`
C. `4.5 :1`
D. `5.5 :1`

Answer

A

Explanation

`bar(upsilon) = R [1/(1^2) -1/(n^2)]`
n=2 for `16(st)` line , n = 3 for `2^(nd)` line
n = 4 for `3^(rd)` line , on solving ratio is `2.5:1`