The equation corresponding to the wave number of spectral lines in Pfund series is

Options

A. `R[1/(4^2) - 1/(5^2)]`
B. `R[1/(3^2) -1/(4^2)]`
C. `R[1/(2^2) - 1/(3^2)]`
D. `R[1/5^2 - 1/(6^2)]`

Answer

D

Explanation

`bar(upsilon) = Z^2 R ((1)/(n_2^2) - 1/(n_2^2))`
`z=1 , n_1 = 5 , n_2 = 6,7,8……`