KCET2008PhysicsThermal Properties of Matter
If a black body emits 0.5 ~J of energy per second when it is at 27^ C , then the amount of energy emitted by it when it is at 627^ C will be
Options
- A40.5 ~J
- B162 ~J
- C13.5 ~J
- D135 ~J
Correct answer
A. 40.5 ~J
Step-by-step solution
According to Stefan's law. E T⁴ E ₁ E ₂ = [ T ₁ ~T ₂ ]⁴ E ₁ 0.5 = [ 273+627 273+27 ]⁴ E ₁=0.5 ( 900 300 )⁴ E ₁=40.5 ~J