GATE Mechanical Engineering (ME) 2013 Solved Paper

Two large diffuse gray parallel plates, separated by a small distance, have surface temperatures of 400 K and 300 K. If the emissivities of the surfaces are 0.8 and the Stefan-Boltzmann constant is 5.67 × 10^-8 W/m²K⁴, the net radiation heat exchange rate in kW/m² between the two plates is