Emission spectrum, , When a gaseous state matter is put in a discharge tube and have very high potential , Apperance is bright lines on a dark background , Obtained when an excited electron returns from high level to low level , Absorbtion spectrum, , When white light passes through a gas, then in to a prisim , Appearance is a continuous spectrum with dark lines crossponding to the wavelengeth absorbed , occure when electron transfer from low level to high level, Emission spectrum due to thermal radiation , , Obtained when incadensent lifght bulb is heated  .

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