How can photon have frequency if its time is zero?

[skeleton]

If I understand correctly:
"Time does not evolve for a photon."

However, a photon has a frequency (which is cycles/time).

Question: how can a photon have a frequency that is preserved while it travels despite the photon not experiencing any elapsing of time?

 

[bcrowell]

The frequency is measured by an observer who sees the wave going by. The time is measured by that observer's clock.

 

[jtbell]

Also, the concept of "photon not experiencing any elapsing of time" is questionable because (as has been discussed in many threads here) in order to talk about "elapsing of time" in a meaningful way you have to refer to a reference frame, and photons don't have inertial reference frames associated with them, that you can apply a Lorentz transformation to.

 

[skeleton]

Thanks guys. It makes sense now.