Solar radiation is incident on the outer surface of a spaceship at a rate of 420 btu/h·ft2. the surface has an absorptivity of αs = 0.10 for solar radiation and an emissivity of ε = 0.6 at room temperature. the outer surface radiates heat into space at 0 r. if there is no net heat transfer into the spaceship, determine the equilibrium temperature of the surface.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?