Exam-style question
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What role does the work function play in the photoelectric effect?.
- A.It determines the maximum speed of emitted electrons.
- B.It is the minimum energy required to remove an electron from a metal surface.
- C.It indicates the frequency of light needed for emission.
- D.It measures the intensity of the incoming light.
Model answer
What a good answer should say
- It is the minimum energy required to remove an electron from a metal surface.
Explanation
Why this works
The work function is the minimum energy required to remove an electron from a metal surface. This concept is crucial in the photoelectric effect, as it explains why only photons with energy greater than the work function can eject electrons, linking the energy of incoming light to the emission of electrons.
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