Quantum Mechanics 2 - Photons
Channel: ViaScience
Date: 2012-10-18

Planck found that to explain the relationship between temperature and radiation he had to assume that radiation energy is transferred in discrete quanta. Einstein pointed out that the so-called photoelectric effect provided convincing evidence that Planck's quanta were real particles, what we now call photons.

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http://www.sps.ch/fileadmin/pictures/Experimente/FromPhotonsToWaves.avi