The equation corresponding to the wave number of spectral line in the Bracket series

Options

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

Answer

B

Explanation

For bracket series `n_(1) = 4, n_(2) = 5,6,7..`