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Physics-

General

Easy

Question

Two circular discs $A a n d B$ with equal radii are blackened. They are heated to same temperature and are cooled under identical conditions. What inference do you draw from their cooling curves, figure

$A a n d B$ have same specific heats
Specific heat of $A$ is less
Specific heat of $B$ is less
Nothing can be said

The correct answer is: Specific heat of $A$ is less

Cooling rate $left parenthesis R right parenthesis$ is rate of tall of temperature, which according to Newton’s law varies inversely as specific heat of the liquid. For $A$ , rate of cooling is larger. Therefore specific heat of $A$ is smaller.

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