Q$3)$ A surface at $2000$K has the emissive charactenstes si

a$)$ Plot the spectral distribution of Emissive power for this real surface and a blackbody at the same remperature. $)=3\mathrm{.}742{10}^2(W)m\frac{i^4}{m^2}$;$C_2=(1\mathrm{.}439{10}^{1}mK$

b$)$ Calculate the emissive power for the surfice by considering

i$)$ Gray surface behaviour for the entire band in which radiations are being emitted.

i$)$ Gray surface behaviour in the region $0-1m,1-2\mathrm{.}5m,$ and $2\mathrm{.}5-5m$