Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-diagram based-Easy-Class 12
A diagram shows a metal surface being heated, which results in the emission of electrons. What is the process called by which electrons are emitted from the metal surface due to heating?
A
Thermionic emission
B
Photoelectric emission
C
Field emission
D
Secondary emission
Correct Answer
Option A
Detailed Explanation
When a metal surface is heated, sufficient thermal energy is imparted to free electrons to enable them to overcome the work function and be emitted. This process is known as thermionic emission.
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