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= Planck relation
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Photon energy is proportional to its frequency:
$$
energy = (plancks \space constant) * (frequency)
$$
or with common weird variables:
$$
E = h * \nu
$$

This only makes sense if the <photon> exists, there is no classical analogue, because the energy of classical waves depends only on their amplitude, not frequency.

Experiments that suggest this:
* <photoelectric effect>
* <Compton scattering>


 Planck-Einstein relation

ID: planck-einstein-relation