Exploring the Constant Frequency of EM Waves

AI Thread Summary
When an electromagnetic (EM) wave transitions between different media, its frequency remains constant due to the boundary conditions that the electric and magnetic fields must meet. Specifically, the perpendicular component of the electric displacement vector D must be equal at the boundary to ensure continuity. This requirement can only be fulfilled if the frequency of the wave is the same on both sides of the boundary. The discussion highlights the fundamental principles governing EM wave behavior at interfaces. Understanding these principles is crucial for applications in optics and telecommunications.
Swapnil
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I was wondering, when an EM wave goes from one medium to another why is it that the frequency remains constant?
 
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The perpendicular component of the electric displacement vector D, must be equal at the boundary AT ALL TIMES to preserve continuity - this is only possible if the frequency of the wave on both sides of the boundary is the same.

Claude.
 
Makes sense. Thanks! :cool:
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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