Exam-style question
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How does the energy of a photon relate to the work function of a metal in the photoelectric effect?.
- A.Photon energy must equal the work function for emission.
- B.Photon energy is always greater than the work function.
- C.Photon energy is less than the work function.
- D.Photon energy has no relation to the work function.
Model answer
What a good answer should say
- Photon energy must equal the work function for emission.
Explanation
Why this works
In the photoelectric effect, for an electron to be emitted from a metal surface, the energy of the incoming photon must be equal to or greater than the work function of the metal. If the photon energy is less than the work function, no electrons will be emitted.
Common mistake
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