Why does the line spectrum of hydrogen include light of different wavelenghts?
Answer:
One H atom has one electron, to be sure, but when you use a normal sample of the gas, there are countless billions of the atoms, so all transitions can happen at once. The different wavelengths occur when an electron falls from a higher level to a lower level and gives out a photon of a particular wavelength. Spread out between all the countless billions of atoms, you will see all the transitions happening at the same time.
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