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Abstract According to the classical wave theory of light, a monochromatic train of waves ceases to be monochromatic if it is interrupted-say by a mechanical shutter. In the above an attempt has been made to explain this result of classical theory from the point of view of quanta. Two points of view are presented. In both the important assumption is that the mechanism which interrupts the wave may contribute to the energy of the quantum passing through it.
Breit et al. (Wed,) studied this question.