What exactly happens inside the discharge ray tube which is filled with hydrogen?
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A hydrogen discharge tube is a slim tube containing hydrogen gas at low pressure with an electrode at each end. If you put a high voltage across this (say, 5000 volts), the tube lights up with a bright pink glow. If the light is passed through a prism or diffraction grating, it is split into its various colours.
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the cathode ray is given out from discharge tube
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