Q. The quantities of heat required to raise the temperature of two solid copper spheres of radii $r_1$ and $r_2$ ($r_1 = 1.5\ r_2$) through 1 K are in the ratio :
A) $\frac{9}{4}$
B) $\frac{3}{2}$
C) $\frac{5}{3}$
D) $\frac{27}{8}$
Explanation
[Solution] $Q \propto m \propto r^3$: $(1.5)^3 = 27/8$. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.