Quantisation of Radiation

Quantisation of Radiation

A law initially introduced by Max Plank to solve a problem with black body radiation (specifically to do with efficient lightbulbs) led to quantum theory. This law states that electromagnetic energy can only be emitted/absorbed in specific (quantized) amounts. This is now known to be due to electromagnetic radiation not being a continuous wave but many photons, "packets of light". The energy of a photon (E) is proportional to the frequency (f). At the time it was only a mathematical trick used by Plank to solve a frustrating problem and he both considered it unphysical and struggled with the implications. However, Einstein would link this concept to photons and this equation is now remembered as the birth of a quantum theory.

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