Exam-style question
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Explain how photon theory accounts for the threshold frequency in the photoelectric effect.
Model answer
What a good answer should say
- Photon theory states that light consists of discrete packets of energy called photons.
- For the photoelectric effect to occur, photons must have a minimum energy, which corresponds to the threshold frequency.
- If the frequency of the incident light is below this threshold, no electrons are emitted, regardless of the intensity of the light.
Explanation
Why this works
This answer is strong because it directly addresses the relationship between photon energy and frequency, demonstrating an understanding of the photoelectric effect. It tests the student's ability to connect theoretical concepts with observable phenomena.
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