Evidence for the particle nature of light

As the new ideas presented by Planck were being discussed, Albert Einstein turned his attention to the specific nature of the quantum of light. As he pointed out, Maxwell's classical theory had been truly tried and tested with respect to the propagation of light; it had nothing to say, however, about how radiation interacts with matter, how it is emitted or absorbed. Is the energy in a quantum concentrated at a point, or is it spread over the whole wave front? If it were concentrated, it would have a much greater effect locally. If, for example, it were to interact with an electron, could it deliver to it a 'short sharp shock'?

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