Photons cannot interact with each other. Photons from the same source also cannot overtake each other even though they can have energy differences. These differences are consequences of frequency/wavelength variations allowing the phenomena of interference, coherence and phase property. However, when photons interact with matter waves their velocities decreased and became slower than the charged particles traveling along the same direction within the medium of propagation. This is the culmination of Cerenkov’s experiments in 1934, seminal demonstrations of the bluish radiation analogous to sonic booms.


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