Q. Two black metallic spheres of radius $4m$, at $2000\ K$ and $1m$ at $4000\ K$ will have ratio of energy radiation as
A) 1 : 1
B) 4 : 1
C) 1 : 4
D) 2 : 1
Explanation
(a) $\frac{Q_{1}}{Q_{2}} = \frac{r_{1}^{2}T_{1}^{4}}{r_{2}^{2}T_{2}^{4}} = \frac{4^{2}}{1^{2}} \times \left( \frac{2000}{4000} \right)^{4} = 1$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.