consider a cavity at 6000k

a) At what wavelength is the radiated power per unit wavelength band a maximum?

b) What fraction of the total radiated power lies in the visible wavelength band 400-700nm?

c) What is the total radiated power that emerges from a small hole in the cavity of area a = 2mm2?

d) What limitations, if any, might be imposed on the size of a hole in which one might expect emerging cavity radiation to exhibit a blackbody spectrum?

 
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