= Photon
{tag=Elementary particle}
{wiki}
Initially light was though of as a wave because it experienced interference as shown by experiments such as:
* <double-slit experiment>
* https://en.wikipedia.org/wiki/Newton%27s_rings
But then, some key experiments also start suggesting that <light> is made up of <discrete> packets:
* <Compton scattering>, also suggests that photons carry momentum
* <photoelectric effect>
* <single photon production and detection experiments>
and in the understanding of the 2020 <Standard Model> the photon is one of the <elementary particles>.
This duality is fully described mathematically by <quantum electrodynamics>, where the photon is modelled as a quantized excitation of the photon field.
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