Special Relativity. Lifetime.

[John 6IX Breezy]

Nah, thanks to quantum theory, there is no fundamental difference between light and other particles, it's applicable universally. The frequency and time for a cycle are just the reciprocal of each other: 5 Hz means 1/5th of a second etc.

Hmm then again, perhaps frequency means different things depending on what it's describing. 5 Hz in neurons means they've fired 5 action potentials in the span of a second, but it does not mean each action potential lasts 1/5th of a second. To increase the frequency the time between cycles decreases, but not how long each cycle lasts.

If sawtooth and square waves decompose into sine waves then I retract what I said about them.