The Photoelectric Effect shows the Dual nature of light | What is a Photon?
Channel: For the Love of Physics
Date: 2023-04-20

The Photoelectric Effect sowed one of the earliest seeds for the ideas of Quantum Mechanics, which ultimately got Albert Einstein his Nobel Prize in Physics.

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The photoelectric effect is the emission of electrons from a material when light falls on its surface. This phenomenon was first observed by Heinrich Hertz in 1887 and explained by Albert Einstein in 1905. Einstein's explanation showed that light could act as both waves and particles, leading to the development of quantum mechanics. The photoelectric effect has become a crucial aspect of modern physics, with applications in solar cells and photoelectric sensors. The effect occurs when photons of light transfer energy to electrons in the material, causing them to be emitted from the surface. The energy of the photons must be greater than the material's threshold frequency for the effect to occur.

00:00 Introduction
01:51 Photoelectric Experiment
07:32 Experimental Observations
18:33 Einstein's Quantum Theory of Light

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