I'm reading my physics text, Matters and Interactions, and there is an example about why Hydrogen gas is transparent in visible light. It says it is transparent because visible light has energies from 1.8 to 3.1eV, and in order to move a Hydrogen atom from ground state to the first excited state, requires 10.2eV. I read online that if a current is passed through a container of hydrogen, some light is emitted, and if this light emitted is put through a prism, 4 bands of light are observed. So say, instead, only UV light was passed through a container of hydrogen gas, would any atoms rise energy levels? UV light has energy of 100 eV, so this is enough energy, but I could not find anything on the internet about this. What color would this light emitted be, if any light was emitted?