what is photon ?give it's 2properties
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A photon is the smallest discrete amount or quantum of electromagnetic radiation. It is the basic unit of all light. Photons are always in motion and, in a vacuum, travel at a constant speed to all observers of 2.998 x 108 m/s. This is commonly referred to as the speed of light, denoted by the letter c.
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photon is a type of elementary particle.
they have zero mass and rest energy.
they have no electric charge
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