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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