Physics - Heat & Thermo Question with Solution | TestHub

In the figure shown below, there are two large planes maintained at temperature of $27^{\circ }\mathrm{C}$ and 127${}^{\circ }\mathrm{C}$ respectively. The surfaces are comple black. Taking Stefan's constant to $\frac{17}{3}\times 10^{-8}\mathrm{W}/{\mathrm{m}}^2{\mathrm{K}}^4$, what is the rate of heat transfer per unit area between the plates?