What are photons? What role did Einstein's explanation of the photoelectric effect play in the d

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What are photons? What role did Einstein's explanation of...

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Key Concepts

Photon

A photon is a fundamental quantum unit of electromagnetic radiation that carries energy and momentum. It is considered both a particle and a wave, embodying the concept that light and other forms of electromagnetic radiation interact with matter in discrete packets.

Photoelectric Effect

The photoelectric effect is the phenomenon where electrons are ejected from a material when it is illuminated by light. This effect provided evidence that light is quantized, as only photons with enough energy could dislodge electrons, which was a pivotal discovery in the development of quantum mechanics.

Wave-Particle Duality

Wave-particle duality is the principle that light and other quantum entities exhibit both wave-like and particle-like properties. Einstein’s explanation of the photoelectric effect supported the particle aspect of light, thereby contributing significantly to the dual interpretation of electromagnetic radiation, where both wave and particle characteristics are essential for a complete understanding.

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