what is photon packet
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Photon, also called light quantum, minute energy packet of electromagnetic radiation. The concept originated (1905) in Albert Einstein's explanation of the photoelectric effect, in which he proposed the existence of discrete energy packets during the transmission of light.
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The subatomic particle that carries the electromagnetic force and is the quantum of electromagnetic radiation. The photon has a rest mass of zero, but has measurable momentum, exhibits deflection by a gravitational field, and can exert a force.
You can squeeze it and stretch it and even chop it up, but a photon is still a photon, a particle of light. ... The wave function for a single photon is usually a “wave packet”–nearly zero everywhere except in a narrow range of space and time.