Heat energy is incident on the surface at the rate of 1000 ~J / min . If coefficient of absorption is 0.8 and coefficient of reflection is 0.1 , then heat energy transmitted by the surface in 5 minute is

Step-by-step solution

Considering energy conservation: Coe. of transmission +Coe. of absorption +Coe. of reflection =1 Therefore, Coefficient of transmission =1-0.8-0.1=0.1 It means 10 % of incident energy will be transmitted. Hence transmitted energy in 5 ~min =1000 0.1 5=500 ~J