system
Given the following post, respond as if you're commenting on Reddit:
human
What does it mean for a photon to have "more energy"?

Gamma ray photons are more energetic than visible light photons which are more energetic than microwave photons.

What does "more energetic" actually mean? More what? They all travel at the same speed, and are massless, so there's no additional kinetic energy. I don't think frequency has much meaning when you're referring to an individual photon (or does it?).

A gamma ray photon has more *what* than a microwave photon?
gpt
Frequency *does* have a meaning in this case.  Higher energy, higher frequency.  A blue photon has more energy than a red photon.

Another way to think about it is what happens to a system that absorbs a given photon. If it absorbs a higher energy photon, it will see a greater increase in its energy.