Exam-style question
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Explain how the photoelectric effect demonstrates the particle nature of light.
Model answer
What a good answer should say
- The photoelectric effect shows that light can be thought of as particles (photons) because it requires a minimum threshold frequency to eject electrons from a metal surface.
- If the frequency is below this threshold, no electrons are emitted, regardless of the light intensity.
Explanation
Why this works
This question assesses understanding of the particle theory of light as evidenced by the photoelectric effect. A strong answer connects the concept of threshold frequency to the particle nature of light, demonstrating comprehension of key principles in quantum physics.
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