# How to determine light intensity at each frequency in black-body radiation?

When the temperature increases the energy per photon increases, which in part decreases the overall wavelengths of the black-body and the intensity increases because of the emission rate. which means that light intensity at each frequency is determined by the black-body temperature, but this is a full circle. When you introduce energy to a black-body what exactly is happening?

If the energy of photons is determined by the wavelength than what exactly determines the emission rate?