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Q.
Which of the following graph is best explanation of cooling of hot water time ?
Thermal Properties of Matter
Solution:
According to Newton$(s)$ law of cooling. The temperature difference
$\Delta T=T_{2}-T_{1}=ce^{-Kt}\quad\ldots\left(i\right)$
where $c$ and $K$ are positive constants.
From the above expression the temperature difference is exponentially decreasing with time.