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Why doesn't electromagnetic radiation run out of energy the further it travels. i.e. why doesn't the speed of electromagnetic radiation slow down the further it travels?
Wiki User
∙ 12y ago
When you rigorously apply Maxwell's Equations to an accelerating charge, you find that an EM wave moves away from this charge. The E-field changes, resulting in a B-field; the B-field changes, resulting in an E-field. This process can be infinitely repeated with no loss of energy, as long as the EM wave travels through a vacuum. Thus, no loss in energy.
You also find if you do the above that this wave ALWAYS propagates at the speed of light when in a vacuum -- no exceptions. That's just the way our Universe operates.
The EM wave is NOT like a balling rolling on a floor. There is no frictional force on this wave that would cause a loss of energy or a slowing down.
Wiki User
∙ 12y ago
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