Exam-style question
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If the work function of a metal is 3.0 eV, what minimum thermal energy is required to emit electrons?.
- A.1.0 eV
- B.2.0 eV
- C.3.0 eV
- D.4.0 eV
Model answer
What a good answer should say
- 3.0 eV
Explanation
Why this works
The minimum thermal energy required to emit electrons must equal the work function. Therefore, if the work function is 3.0 eV, the minimum thermal energy required is also 3.0 eV.
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