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why CPH has speed Vc and Vc is greater than c?
Answer; since you know photon has spin. Thus the path per time of a point on photon is greater than c it means the speed of photon's elements are greater than c (see following picture).
Does the force constant of a spring changes if it is cut into parts? Ans) Force constant does not change because it is a constant
why electric field is zero inside a cavity
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