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10-2.Transmission of Heat
medium
Two circular discs $A$ and $B$ with equal radii and equal mass are blackened. They are heated to same temperature and are cooled under identical conditions.What inference do you draw from their cooling curves ?
A
$A$ and $B$ have same specific heats
B
Specific heat of $A$ is less
C
Specific heat of $B$ is less
D
Nothing can be said
Solution
$\frac{\mathrm{d} \theta}{\mathrm{dt}}=\frac{\sigma \mathrm{A}}{\mathrm{ms}}\left(\theta^{4}-\theta_{0}^{4}\right)$
$\frac{d \theta}{d t} \propto \frac{1}{s}$
Line $A$ has more slope so specific heat of $A$ is less than $B.$
Standard 11
Physics
