Physics - Modern Physics Question with Solution | TestHub

Taking the wavelength of first Balmer line in hydrogen spectrum$(\mathrm{n}=3\mathrm{ }$to$\mathrm{n}=2)$as$660\mathrm{ }\mathrm{n}\mathrm{m}$, the wavelength of the$2^{\mathrm{n}\mathrm{d}}$Balmer line$(\mathrm{n}\mathrm{ }=\mathrm{ }4\mathrm{ }$to$\mathrm{ }\mathrm{n}\mathrm{ }=\mathrm{ }2)$will be :