Saturday, November 26, 2016

special relativity - Why don't electromagnetic waves require a medium?


As I understand it, electromagnetic waves have two components which are the result of each other, i.e., when a moving electric charge creates a changing magnetic field at point X then a changing electric field is created at point Y and this repeating process is what creates EM waves, so therefore, it requires no medium. Is my understanding correct?


One thing that I'm surprised to know is that light is also called an electromagnetic wave.


Does this include light of any kind, for example: light from a bulb, a tube, and also from the Sun? How do they contain electric and magnetic fields?




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

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