NAME

$4(25$ points$)$

An emitter surface is diffuse and opaque. Its spectral emissivity $e_{}$ is shown in the figure below. The temperature of the surface is maintained at $330$ K $($steady state$)$ and the surface area is $10c{m}^2.$

$($a$)$ Calculate the total emissivity $$ of the emitter.

$($b$)$ Calculate the total emissive power, E$,$ from the emitter, in $\frac{W}{m^2}.$

$($c$)$ A detector with a surface area of $5c{m}^2$ is positioned $2$ m away from the solar panel. Determine the total radiation power emitted from the emitter and received by the detector, in W$.$

$$