In
1900, Max Plank had attempting to explain black-body radiation
suggesting that although light was a wave, in which these waves could
gain or lose energy only in finite amounts related to their
frequency. Plank called these finite amount of light energy as
“quanta”. In 1905, Albert Einstein used these quanta concept to
explain the photoelectric effect supporting that quanta has a real
existence. In 1926, Gilbert. N. Lewis named these little quanta
particles as “Photons”.
Eventually
the modern theory of quantum mechanics came to picture light as both
a particle or a wave. Visible light which can be easily shown in
experiments to be describable using either a wave or a particle model
or sometimes both.
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