AMA | September 2024

9543.2 - 9563.876 Sean Carroll

Temperatures of radiation are associated with wavelengths of radiation. For any given temperature, there is a wavelength at which most of the radiation is coming out, a typical wavelength for the thermal radiation. For a black hole, the typical wavelength of the thermal radiation is roughly the size of the black hole. It's the Schwarzschild radius of the black hole, roughly speaking.