cathode - the negative electrode, anode - the positive electrode, electron - charged particle which flows, thermionic - heating metal results in __________ emission, xray - a harmful, high energy, form of EM radiation, couloumb - the unit of charge, evacuated - emptied/contains a vacuum, number - N is the ____________ of particles, kinetic - movement energy is __________ energy, thermal - heat energy is _________ energy,

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