The process by which a metal, heated to high temperature, gives off electrons from its…

The process by which a metal, heated to high temperature, gives off electrons from its surface is known as
  • A.
    photoelectric emission
  • B.
    thermionic emission
  • C.
    radioactive emission
  • D.
    Held emission
  • E.
    secondary emission
Correct Answer: Option B
Explanation
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