If the magnitude of the Poynting vector of a plane electromagnetic wave is S, its electromagnetic momentum density is:
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Question

If the magnitude of the Poynting vector of a plane electromagnetic wave is S, its electromagnetic momentum density is:

G1 Physics · Accepted Answer

For electromagnetic radiation, energy flux is S. The corresponding momentum density g is related to energy flux by S = gc². Therefore, g = S/c². Correct option: C.