Question

Process of emission of electrons from hot metal surface is called-

• A. electronic emission
• B. electron capture
• C. thermionic emission
• D. none of the above

Answer 1

Answer: (C)

thermionic emission

Thermal energy given to the charge carriers overcome the work function of the metal and thus flow of charge carriers takes place from the metal surface. These charge carriers can be electrons and ions. So, process of the emission of electrons from the hot metal surface is called as thermionic emission.