Exam-style question
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What is the work function of a metal if the energy of emitted electrons is 2.5 eV and the thermal energy supplied is 4.0 eV?.
- A.1.5 eV
- B.2.5 eV
- C.4.0 eV
- D.6.5 eV
Model answer
What a good answer should say
- 1.5 eV
Explanation
Why this works
The work function can be calculated using the formula: Work Function = Thermal Energy - Energy of Emitted Electrons. Substituting the values gives: Work Function = 4.0 eV - 2.5 eV = 1.5 eV.
Therefore, the work function is 1.5 eV.
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