Chemistry - Atomic Structure Question with Solution | TestHub

Heat treatment of muscular pain involves radiation of wavelength of about $900\mathrm{nm}$. Which spectral line of $\mathrm{H}$ atom is suitable for this purpose? $\left[{\mathrm{R}}_{\mathrm{H}}=1\times 10^5{\mathrm{cm}}^{-1}\cdot \mathrm{h}=6.6\times 10^{-34}\mathrm{Js},\mathrm{c}=3\times 10^8{\mathrm{ms}}^{-1}\right]$