Towards the end of 19th century, Physicist were quite comfortable that they had solved all the problems related to Physics. However, there came some phenomena that could not be explained on the basis of existing theories. One of them was the energy from a black body.
The German Physicist, Max Planck, proposed his quantum theory of radiations to explain the energy from the black bodies. He said that the high energy was discontinuously emitted by the particles of a black body. (Classically, the assumption was of the continuous emission of energy). He said that each radiation is associated with a specific frequency which increases with temperature.
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