JEE Main2012PhysicsThermal Properties of MatterActual
The heat radiated per unit area in 1 hour by a furnace whose temperature is 3000 ~K is ( =5.7 10⁻⁸ ~W ~m ⁻² ~K ⁻⁴ )
Options
- A1.7 10¹⁰ ~J
- B1.1 10¹² ~J
- C2.8 10^8 ~J
- D4.6 10^6 ~J
Correct answer
A. 1.7 10¹⁰ ~J
Step-by-step solution
According to Stefan's law E= T^4 Heat radiated per unit area in 1 hour ( 3600 ~s ) is =5.7 10⁻⁸ (300)^4 3600=1.7 10¹⁰ ~J