Hydrogen can be found in interstellar space in form of gas clouds. Interstellar
space is exceptionally cold (?0.01 room temperature). You are observing the light from an
exotic hot star that passes behind the gas cloud. The exotic star emits a continuous spectrum
of photons with energies from 10 to 13 eV. When the star passes behind the hydrogen gas
cloud, you see some photon energies missing in the spectrum of the star. Determine all
spectral lines that are missing from the spectrum of light emitted from the star. Give a
quantitative reason why these are wavelengths that would be missing.