What is the net amount of energy per unit time being received by a body having a temperature of 40 °C in a surrounding of 60°C? (The surface area of body = 2m^2, σ = 5.67*10^-8W/ m^2K^4 & emissivity of 0.4).(a) 122.4W(b) 0.47W(c) 33W(d) 86WI have been asked this question during an online exam.The above asked question is from Thermal Properties of Matter topic in division Thermal Properties of Matter of Physics – Class 11

What is the net amount of energy per unit time being received by a bod

1.	What is the net amount of energy per unit time being received by a body having a temperature of 40 °C in a surrounding of 60°C? (The surface area of body = 2m^2, σ = 5.67*10^-8W/ m^2K^4 & emissivity of 0.4).(a) 122.4W(b) 0.47W(c) 33W(d) 86WI have been asked this question during an online exam.The above asked question is from Thermal Properties of Matter topic in division Thermal Properties of Matter of Physics – Class 11
Answer» Correct option is (a) 122.4W To EXPLAIN I WOULD say: The BODY will RECEIVE some energy from the surrounding and also lose some to it. The net energy RECEIVED will be = AeσT^4 – AeσTS^4 = 20.45.67*10^-8(333^4 – 313^4) = 122.4 W.

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