1. Determine the change in the radiation intensity and 1mm; of the thermal radiation from a black body if its temperature increases from 1000I \"C to 1001 \"C. (25 Marks) An incident energetic photon is scattered by a free electron initially at rest. If the scattering angle of the scattered photon is 90 with respect to the incident photon propagation direction and the scattered photon energy is 0.100 McV, determine the wavelength and momentum of the scattered photon and the incident photon, respectively. (25 Marks)