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JAMB Physics 2006 Question 11

Question 11

Modern Physics

The process through which free electrons leave the surface of hot metals is known as

  1. A.thermionic emission.
  2. B.photo emission.
  3. C.photon emission.
  4. D.electron emission.
Show the answer and explanation

Answer: A (thermionic emission.)

Explanation

Heating a metal gives its free electrons enough energy to escape from the surface; this is thermionic emission.