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When a metal is heated to a high temperature, electrons are emitted from its surface....

Physics
NECO 2000

When a metal is heated to a high temperature, electrons are emitted from its surface. The process is known as

  • A. photoelectric effect
  • B. thermionic emission
  • C. field emission
  • D. secondary emission
  • E. radioactive emission
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Correct Answer: Option B
Explanation

The process by which free electrons are emitted from the surface of a metal when external heat energy is applied is called thermionic emission.

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