The first emision line of hydrogen atomic spectrum in the Balmer series appear at(R=Rydberg constant)

Options

A. `(5R)/(36) cm^(-1)`
B. `(3R)/(4) cm^(-1)`
C. `(7R)/(144) cm^(-1)`
D. `(9R)/(400) cm^(-1)`

Answer

A

Explanation

`barv = R(1/(n_1^2) - 1/(n_2^2)) , n_1 = 2 , n_2 =3 therefore barv = 5R//36`