Which observation is explained by treating light as particles (photons)?
Answer and explanation
Correct answer: A. electrons are emitted from a metal only if the light frequency is high enough
- Step 1: The photoelectric effect shows that a photon's energy depends on frequency. Step 2. Only photons with enough energy can free an electron, whatever the intensity. Answer: the photoelectric effect. Why not the others: Diffraction, interference and refraction are all explained well by wave behaviour.
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