When a Blackbody Is Heated to a Temperature T, Its $\sigma$

Multiple Choice

When a blackbody is heated to a temperature T, its total energy flux per second per unit area F at all wavelengths (where $\sigma$ is a constant) is given by

A) F = $\sigma$ /T².
B) F = $\sigma$ T.
C) FT = $\sigma$ .
D) F = $\sigma$ T⁴.