Exam-style question
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Which statement best describes the relationship between the threshold frequency and the work function of a metal?.
- A.The threshold frequency is directly proportional to the work function.
- B.The threshold frequency is inversely proportional to the work function.
- C.The threshold frequency is equal to the work function divided by Planck’s constant.
- D.The threshold frequency is unrelated to the work function.
Model answer
What a good answer should say
- The threshold frequency is equal to the work function divided by Planck’s constant.
Explanation
Why this works
From E=hf and E=work function, setting hf=Φ gives f_threshold=Φ/h, linking threshold frequency to the metal’s work function as required by photon theory.
Common mistake
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