When one atom emits light, they do so in a separate package called a photon. When this light is measured, this discrete or granular nature leads to small brightness fluctuations because two or more photons never emit simultaneously.
When one atom emits light, they do so in a separate package called a photon. When this light is measured, this discrete or granular nature leads to small brightness fluctuations because two or more photons never emit simultaneously.
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