Question on: JAMB Physics - 2019
The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission
A
I & II
B
II & III
C
III & IV
D
IV & V
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Correct Option: C
Since the conduction of gases is at low pressure and high voltage, the process is called field or cold cathode emission.
A cold cathode is a cathode that is not electrically heated by a filament. A cathode may be considered "cold" if it emits more electrons than can be supplied by thermionic emission alone. It is used in gas-discharge lamps, such as neon lamps, discharge tubes, and some types of vacuum tube
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