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## Main Question or Discussion Point

If time stops at the velocity of light, how can a photon oscillate with a frequency?

Frequency is defined with cycles/second.

Frequency is defined with cycles/second.

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If time stops at the velocity of light, how can a photon oscillate with a frequency?

Frequency is defined with cycles/second.

Frequency is defined with cycles/second.

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It doesn't, for the same reason a photon does not have a "rest frame". We have a FAQ on this:If time stops at the velocity of light

https://www.physicsforums.com/threads/rest-frame-of-a-photon.511170/