The spectral absorptivity of an opaque surface and the spectral distribution of radiation incident on the surface are depicted below.
![1574_8f2634dc-dd71-4904-9ba3-f6936c22a016.png](https://secure.tutorsglobe.com/CMSImages/1574_8f2634dc-dd71-4904-9ba3-f6936c22a016.png)
What is the total absorptivity of the surface? If it is assumed that ελ = αλ and that the surface is at 1000 K, what is its total emissivity? What is the net radiant heat flux to the surface?