Number of visible lines when an electron returns from 5th orbit to ground state in H spectrum :

Options

A. `5`
B. `4`
C. `3`
D. `10`

Answer

C

Explanation

Shortest wave length of Lyman series of H-atom
`1/lambda=1/x=R[1/((1)^(2))-1/((oo)^(2))]` So, `x=1/R`
For Balmes series
`1/lambda=R (1)^(2){1/((2)^(2))-1/((3)^(2))}`
`1/lambda=1/x xx5/36` so, `lambda=(36 x)/(5)`