Question

A star with a radius four times that of our Sun is observed to have a rough blackbody spectrum that peaks around 400nm. The star illuminates a planet with the mass of the Earth at a distance of 0.7AU. This planet has a radius twice that of the Earth and absorbs a power of 2.82*10¹⁹ W.
a) What is the planet’s albedo? The constant in Wien’s law is 2.9*10^-3 m x K

b) Assuming the equilibrium temperature is approximately that of the surface, would we expect much helium to be present in the planet’s atmosphere?

Answer 1