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JAMB Physics 2009 Question 48

Question 48

Modern Physics

Thermionic emission is the process whereby

  1. A.β-rays are produced.
  2. B.holes are produced.
  3. C.x-rays are produced.
  4. D.electrons leave a hot element.
Show the answer and explanation

Answer: D (electrons leave a hot element.)

Explanation

In thermionic emission, heating a metal gives its free electrons enough energy to escape from its surface.