Why can't frequency of an electromagnetic wave change?

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SUMMARY

The frequency of an electromagnetic wave remains constant when transitioning between different media due to the fundamental properties of wave-particle interactions. As light enters a medium with a different refractive index, its velocity and wavelength change, but the frequency remains unchanged to maintain energy conservation. This principle is supported by experimental evidence, which confirms that the frequency of light is intrinsically linked to the oscillation of particles at the interface of materials, ensuring that the wave propagates with the same frequency throughout the medium.

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  • Understanding of electromagnetic wave properties
  • Familiarity with refractive index concepts
  • Basic knowledge of wave-particle interactions
  • Awareness of experimental physics principles
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  • Research the relationship between wavelength and frequency in different media
  • Study the principles of energy conservation in wave mechanics
  • Explore the effects of refractive index on light propagation
  • Investigate experimental methods used to measure light frequency
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Students of physics, optical engineers, and anyone interested in the fundamental principles of light behavior and wave mechanics.

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I understand the relationship between velocity and wavelength when the refractive index changes but I can't fully understand why frequency cannot change. What would happen if it did? why can't the speed of light stay constant as frequency and wavelength change to keep it. Is it because of experiments that we know it is constant?

I want a better understanding of why it cannot change.
 
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You can accept that it follows from experiment. But you can also imagine that an incoming wave forces the particles of matter at the interface vibrate at the same rate as its frequency. These vibration of the particles next to the interface force the neighbouring particles to vibrate and so the wave travels in the matter, with the same frequency as the incoming one.

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