Question

what is hydrogen spectrum?

Answer 1

A Hydrogen atom consists of only one proton and the electron that revolves in the electron cloud. The emission spectrum of Hydrogen is observed when the Hydrogen molecule breaks up into Hydrogen atoms and the electrons present in them are promoted to higher energy levels. 

The transition of electrons between the energy levels gives out a spectrum and hence the name. 
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Answer 2

Answer: when light is passes through a substance it absorbs light of some wavelength and therefore the spectrum obtained has some missing lines this is called absorption spectrum

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