01 January 1970 24 959 Report

How does light know its speed and maintain that speed?

The energy of light is E=hf, and the momentum is P=h/λ. The energy of light excites the momentum of light; the momentum of light carries the energy of light as it travels. If we observe from the perspective of momentum conservation, as long as the initial speed of light is c, it will always maintain this speed c in free space. but it is not that light knows this speed, it's that we know this speed.

If light does not cooperate with space-time (i.e., space-time is not involved in the control of the speed of light), how can it control itself to travel a wavelength of distance forward per unit time? And maintain the same speed in different inertial systems (with different spacetime measures)?

If spacetime is involved in the control of the speed of light, does the definition of energy-momentum of light have the supremacy?

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