The first line of the Paschen series in hydrogen spectrum has a wavelength of `18800 Å`. The short wavelength limit of Paschen series is

Options

A. `1215 Å`
B. `6560 Å`
C. `8225 Å`
D. `12850 Å`

Answer

C

Explanation

Here `(1)/(18800 Å) = R [(1)/((3)^(2)) - (1)/((4)^(2))] = (7R)/(144) ` and for series limit `(1)/(lambda) = R [(1)/((3)^(2)) - (1)/((oo)^(2))] = (R)/(9)`
`rArr " " lambda = 18800 xx (7)/(16) = 8225 Å`