Exam-style question
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What evidence supports the argument that wave theory is insufficient alone?.
- A.The observation of light behaving as particles in the photoelectric effect.
- B.The ability of wave theory to predict interference patterns.
- C.The speed of light being constant in a vacuum.
- D.The existence of electromagnetic waves.
Model answer
What a good answer should say
- The observation of light behaving as particles in the photoelectric effect.
Explanation
Why this works
The photoelectric effect shows that light can eject electrons from materials only when the light's frequency exceeds a certain threshold, which cannot be explained by wave theory alone. This evidence necessitates the inclusion of particle theory for a complete explanation.
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