Exam-style question
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In the context of thermionic emission, what is the work function?.
- A.The energy required to heat the metal
- B.The energy needed to remove an electron from the metal
- C.The energy of the emitted electrons
- D.The energy lost during electron emission
Model answer
What a good answer should say
- The energy needed to remove an electron from the metal
Explanation
Why this works
The work function is defined as the minimum energy required to remove an electron from the surface of a metal. It is a crucial factor in thermionic emission as it determines whether electrons can be emitted when the metal is heated.
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