Q.
Water and turpentine oil (specific heat less than that of water) are both heated to same temperature. Equal amounts of these placed in identical calorimeters are then left in air
A) Their cooling curves will be identical
B) $A$ and $B$ will represent cooling curves of water and oil respectively
C) $B$ and $A$ will represent cooling curves of water and oil respectively
D) None of the above
Explanation
(b) As we know, Rate of cooling $\propto \frac{1}{specific\ heat(c)}$
$\because c_{oil} < c_{Water}$
$\Rightarrow (Rate\ of\ cooling)_{oil} > (Rate\ of\ cooling)_{Water}$
[image:11_image55.emf]
It is clear that, at a particular time after start cooling, temperature of oil will be less than that of water
So graph $B$ represents the cooling curve of oil and $A$ represents the cooling curve of water
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.