And also this: What is the maximum possible frequency and wavelength?
The second question is contradictory; maximum frequency -> minimum wavelength.
I am asking the very opposite;
What is the minimum frequency and maximum wavelenght of electromagnetic radiation?
The lowest measured/defined seems to be 3 Hz; ELF-waves Which means a wavelenght 1/3 of the speed of light; ~100 000 000 m.
But this can't be the physical limit for the wavelenght.
Does such a physical limit for the wavelength exist? (Similar limit like the speed of light is for velocity).