Albert Einstein


Physicist


University of Zurich


Rämistrasse 71
CH-8006 Zürich, Switzerland


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Albert Einstein


Physicist


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Albert Einstein


Physicist


University of Zurich


Rämistrasse 71
CH-8006 Zürich, Switzerland


Google Scholar
Wikipedia
Facebook
Twitter


Photoelectric effect


In 1905, Albert Einstein described light as composed of discrete quanta, called photons, rather than continuous waves. Based upon Max Planck's theory of black-body radiation, Einstein theorized that the energy in each quantum of light was equal to the frequency multiplied by a constant, later called Planck's constant. A photon above a threshold frequency has the required energy to eject a single electron, creating the observed effect. This discovery led to the quantum revolution in physics and earned Einstein the Nobel Prize in Physics in 1921. [Wikipedia](https://en.wikipedia.org/wiki/Photoelectric_effect)

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