Friday, September 20, 2019

visible light - What starts the movement of a photon


Although a photon has no (rest) mass, it does have a measurable speed. Its movement can be altered by gravity. A photon "travels". If I turn on a flashlight, seen by someone at a distance, the photons from that flashlight traveled, at the speed of light, from the flashlight to the observer. But what "force" instantly starts the movement of a photon at the speed of light?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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