Exam-style question
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In the photoelectric effect, what does the threshold frequency represent?.
- A.The minimum frequency needed to emit electrons
- B.The maximum frequency that can be absorbed
- C.The frequency at which light is completely absorbed
- D.The frequency of the emitted electrons
Model answer
What a good answer should say
- The minimum frequency needed to emit electrons
Explanation
Why this works
The threshold frequency is the minimum frequency of incident light required to eject electrons from a material. Below this frequency, no electrons are emitted regardless of the intensity of the light.
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