What is the wavelength of light for the least energetic photon emitted in the Lyman series of the hydrogen atom spectrum lines? (Take $h=6.63×10^{-34} Js$; $c=3×10^8 ms^{-1}$; $e=1.6×10^{-19} C$)

122 nm 12.2 nm 1.22 nm 10.2 nm

122 nm

The correct answer is Option (1) → 122 nm