name the process of emitting electrons from the heated cathode ?
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Cathode heater. ... The cathode heats to a temperature that causes electrons to be 'boiled out' of its surface into the evacuated space in the tube, a process called thermionic emission. The temperature required for modern oxide-coated cathodes is around 800–1,000 °C (1,470–1,830 °F).
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discharge tube experiment
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