Heat and Mass Transfer

A blackbody food dehydration surface ($1.0\text{ m}^2$) is heated to $400\text{ K}$. Assuming an ideal black surface emissivity of $\epsilon = 1.0$ and Stefan-Boltzmann constant $\sigma = 5.67 \times 10^{-8}\text{ W/(m}^2\cdot\text{K}^4)$, calculate the total radiant emissive power in $\text{W}$.