Thermal Radiation Homework: Ranking Objects of Same Material

[tjr39]

Homework Statement

Consider the following three solid object all made of the same material;
1) Cube of edge length r
2) Sphere of radius r
3) Hemisphere of radius r

All object are maintained at a temperature 350K in an envorinment at temperature 300K. Rank the objects according to the net rate at which they exchange thermal radiation with the environment. Justify for full marks.

Homework Equations

The Attempt at a Solution

Im not sure whether to list them simply in order of surface area or not? Is there something else I should be considering? Cheers.

 

[rock.freak667]

Im not sure whether to list them simply in order of surface area or not? Is there something else I should be considering? Cheers.

So if you list them in terms of surface area, why would you justify it to be in that order?

Even though you have the correct idea, you should know this formula $E=A \sigma T^4$ (Stefan's law of black body radiation)