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A quantum or how much is the least amount of energy that can be transmitted at any wavelength.
Considered the creator of quantum theory, the German physicist Max Planck stated that electromagnetic radiation is emitted in discrete units of energy called quantum or quantos.
For classical physics, a certain frequency oscillator could emit any part of its total amount of energy regardless of its value. In reality, the quanta or units of radiation are so small that the radiation seems continuous.
Einstein, in 1905, explained the photoelectric effect using the theory of quanta, admitting that light travels through space in the form of quanta. This quantum of radiation was subsequently given the name of photon.
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