Physics WAEC

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

Correct Answer: Option C

C. III & IV

Explanation

As conduction of gases is at low pressure and high voltage, called field or cold cathode emission.

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