General Science • PhysicsMedium
Which of the following describes the emission of electrons from a heated metal surface?
A. Field emission
B. Thermionic emission✓ Correct Answer
C. Secondary emission
D. Photoelectric emission
💡 Solution & Explanation
Thermionic emission refers specifically to the thermal release of electrons from heated metal surfaces when thermal energy overcomes the electrostatic forces holding the electrons inside the lattice. Field emission involves high-voltage electric fields instead of heat, while photoelectric emission utilizes light photon energy. This principle forms the foundational operational mechanism of traditional vacuum tubes and cathode-ray tube displays.
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