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I recall that whenever an electron in a higher-than-normal orbit falls back to its normal orbit and produces photon. So shouldn't the photon accelerate from 0?

Qmechanic
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Vibhuti Bhushan Rai
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1 Answers1

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No. Photons cannot travel at any velocity but $c$ when in a vacuum. When traveling through transparent matter, you can get a lower speed according to the index of refraction, but the photon comes into existence traveling at that speed, and any photons absorbed while traveling in that medium will disappear while traveling at that speed.

Sean E. Lake
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