Exam-style question
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What is the work function in the context of thermionic emission?.
- A.The energy required to ionize an atom
- B.The energy needed to release an electron from a metal
- C.The energy gained by an electron when heated
- D.The energy lost by an electron during emission
Model answer
What a good answer should say
- The energy needed to release an electron from a 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. In thermionic emission, electrons must acquire energy equal to or greater than this work function to be emitted.
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