Thermionic emission is the process whereby?
A
β - rays are produced
B
holes are produced
C
x - rays are produced
D
electrons leave a hot element
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Thermionic emission is ejection of electron from a metal surface as a result of heating.
Source: WAEC / JAMB / NECO Classroom Archive (Record #14267)