1.

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

Answer»

`1215 Å`
`6560 Å`
`8225 Å`
`12850 Å`

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


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