What is the shortest wavelength present in the Paschen series of spectral lines?
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form Rydberg's formula, `(hc)/lambda=13.6xx1.6xx10^(-19)[1/(n_1^2)-1/(n_2^2)]` for shortest wavelength in Paschen series, `n_2=oo and n_1 =3` `:. (hc)/lambda=21.67xx10^(-19)[1/(3^2)-1/((oo)^2)]=2.42xx10^(-19)` `lambda=(hc)/(2.42xx10^(-19))=(6.6xx10^(-34)xx3xx10^8)/(2.42xx10^(-19))m=8.1818xx10^-7m=818.18 nm`
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