Question

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

Answer 1

We know that a wave which has greater frequency will have low wavelength and high energy. So, by decreasing the wavelength, the frequency and consequently energy (intensity) of that wave will increase or vice versa.

Answer 2

When the temperature increases the energy per photon increases, which in part decreases the overall wavelengths of the black-body and the intensity increases ...