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... particles, most scientists accepted Young's experiment as proof of the wave theory of light. In 1901 Max Planck found a formula, which was correct for all wavelengths. Planck's formulation fitted the precisely determined spectrographic data then with great accuracy. E = h f where h is the Planck's constant and f is the frequency of the radiated energy. In 1905, Einstein revealed that light itself is quantized. Einstein reasoned that if light emitters can have only certain values of energy, then the energy they emit as light would retain its quantized character. The light comes in tiny packets of energy that are known as quanta. The concept of light as quantized energy explained how light behaves as a particle in certain experiments, instead of as a wave. These particles of light came to be called photons. The wave theory cannot explain this behaviour; if electromagnetic radiation is a continuous ...