Question

Four spheres A, B, C and D of different metals but of same radius are kept at same temperature. The ratio of their densities and specific heats are 2 : 3 : 5 : 1 and 3 : 6 : 2 : 4. Which sphere will show the fastest rate of cooling (initially) -

• A. A
• B. B
• C. C
• D. D

Answer 1

Answer: (B)

B

Answer 2

$\frac{dv}{dt} \propto \frac{A}{rms}$