pic from csep.ukHydrogen gas in its ground state is not able to absorb light and give us the absorption spectrum as the the first transition requires ultraviolet frequency. To produce the absorption spectrum of hydrogen some other process like heating of the gas would make the light absorption spectrum possible. Theoretically , you can get have the same absorption spectrum and emission spectrum of exactly the same wavelength but experimentally it may be difficult to get results.
Many find energy levels difficult. Levels are not visible. To understand the above , just imagine yourself at ground level (just started working) , you will not be able to afford the downpayment for a house (level 1) because there is a big gap in monetary terms. If someone offer to get you to level 1 , then to met the condition to jump to level 2 is much easier. So your financial status is not visible like the energy level in atom.
