Depends if you care about names or about physics. Radio, Infrared Gamma etc are just names we give to various parts of the continuous electromagnetic spectrum. The edges of these definitions are not super well defined. Changing from RF to microwave could be defined at say about 3 GHz, but there is not some clear physical difference between a 2.9 GHz photon and a 3.1 GHz photon other than the frequency change.
The lower limit to the frequency is I guess the inverse of the theoretical age of the universe/2. Something can’t currently be oscillating slower than that.
There are some theories on plank length, quantisation limits, etc that might set some theoretical upper limit of photon frequency. But we don’t appear to be anywhere close to observing such things. We have seen some rather crazy short wavelength particles that we haven’t fully understood.
I installed fedora to replace windows on the 31/12/2023. I wasn’t a complete Linux noob by any measure but haven’t run it as a main OS before. Thank you proton for getting me over the edge.
The whole repo situation on fedora is honestly pretty meh, things are out of date or broken too often. Or they just don’t exist. I have put arch on a number of machines since and find it significantly better. My main box will move away from fedora next time I’m enthused to mess with it and this is the primary reason.