Ciro Santilli
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Photon | 🗖 nosplit | ↑ parent "Elementary particle" | 116, 33, 2k

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Initially light was though of as a wave because it experienced interference as shown by experiments such as:
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But then, some key experiments also start suggesting that light is made up of discrete packets:
and in the understanding of the 2020 Standard Model the photon is one of the elementary particles.
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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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