Spectrum of hydrogen atom and spectral seriesMedium

Hydrogen Atomic Spectral Series

Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this ?
Given: Rydberg constant
R_H = 10⁵ cm^–1, h = 6.6 × 10^–34J s, c = 3 × 10⁸ m/s)

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