Principles of Physics IV
The photoelectric effect is the phenomenon where electrons are ejected from a material when it is exposed to light of sufficient energy, demonstrating the particle-like behavior of light. This effect not only illustrated the dual nature of light but also led to significant advancements in quantum mechanics, challenging classical physics' understanding of light and matter interaction. It revealed that light can behave both as a wave and as a particle, depending on the experimental setup, thus playing a crucial role in the development of quantum theory.
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