Q1. Calculate relation between radiation power if sphere with temperature 1000k and diameter 100m and smother sphere with twice less temperature and twice large diameter.
Q2. How much lines per one mm has the diffraction grating, if it's seconds order of maximum for light with wavelenght 0.5 um is situated at the angle 300.
Q3. Which photon has more energy a phonton of ultraviolet radiation of a phonton of yellow light.