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Radiation Problem Related to Basic Laws of Radiation

Calculate the following for a spherical ball in the form of a black body emitting radiation at 2500°C. Monochromatic emissive power at 1.2 µm length. The wavelength at which the emission is maximum Maximum emissive power Total emissive power in W/m2, and Total emissive power (in W/m2) of the ball if it is assumed as a real surface with emissivity equal to 0.9 Total emissive power of the ball if the diameter of the spherical ball is assumed as 109 m and emissivity is 0.9. Assuming the sun to be a black body. It is observed that the intensity of the radiation emitted by the sun is maximum at a wavelength of 0.49 µm. Estimate its surface temperature and emissive power. A black body is kept at a temperature of 827°C. Estimate the fraction of the thermal radiation emitted by the surface in the wavelength band of 2 and 6 µm