Exam-style question
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Why was wave theory alone insufficient to explain the photoelectric effect?.
- A.Wave theory could not account for the particle nature of light.
- B.Wave theory suggested that light could not exert pressure.
- C.Wave theory predicted that light would not have a threshold frequency.
- D.Wave theory explained all observations of light perfectly.
Model answer
What a good answer should say
- Wave theory could not account for the particle nature of light.
Explanation
Why this works
The photoelectric effect demonstrated that light has particle-like properties, as it requires photons to have a certain threshold frequency to eject electrons, which wave theory alone could not explain.
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