Isn't It Cool to Measure the Frequency of the Light Wave?

The trickpart thog is measuring the frequency of the light wave, right? Because, i mean, that's like gigger herds. You don't really have a clock that can measure that. But you're right, when we actually want to figure this out ourselves, then we use very precise cavities. And we measure the resonanc frequency and wave lents of the modes simultaneously. Combine those two numbers together and boom, that's the speed of iinteresting, but i guess nino inside the mark wave, isn't it bombarded by marco ways from all directions? Is it the wave inside my mik wave that like coherent, that untouched, that sort of neat?