" 1.Find the smallest wavelength in emission spectra of (a) hydrogen,(b) He "

Define - Emission Spectra

Atomic spectra of hydrogen atom

The longest wavelength in the ultraviolet region of the hydrogen spectrum is 120nm. What is the smallest wavelength in the infrared region of the hydrogen spectrum ?

The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is