Q. A black body is at 727° C. It emits energy at a rate which is proportional to
A) (1000)⁴
B) (1000)²
C) (727)⁴
D) (727)²
Explanation
[Solution from source] By Stefan's law the emitted power ∝ T⁴ with T in kelvin: 727 + 273 = 1000 K, so rate ∝ (1000)⁴. Using 727 forgets to convert from Celsius. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.