AP Physics 2
15.5 The Photoelectric Effect
15.1 Quantum Theory and Wave-Particle Duality
In an experiment, a beam of extremely low-intensity ultraviolet light is directed at a clean zinc plate, and photoelectrons are detected almost instantaneously. In contrast, when a very high-intensity beam of red light is directed at the same plate for a prolonged period, no photoelectrons are emitted. Which of the following statements correctly explains why the photon model of light accounts for these observations, whereas the classical wave model fails?
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