What is beyond the electromagnetic spectrum?

Keep in mind that the different 'kinds' are merely human labeling conventions for a spectrum that is continuous in the mathematical sense. There is no feature of "radio" that distinguishes it objectively from microwaves. read more

Beyond that, we don't know. There may be higher frequency sources out there that haven't reached us, or it may be that beyond those incredibly high frequencies the physics of particle interactions breaks down, but there's no known theoretical limit. read more

So, given the scales of frequencies that our science is familiar with, The high end would be gamma rays, with frequencies of 300 EHz, the low end being extremely low frequency waves of 3 Hz. read more

Electromagnetic spectrum. The electromagnetic spectrum is a collective term; referring to the entire range and scope of frequencies of electromagnetic radiation and their respective, associated photon wavelengths. read more