For a system with newtons law of cooling applicable the initial rate of cooling is $R^0\ C/sec$ find the time when temperature diff. $\Delta T_0 =$ initial temperature difference, is reduced to half.
Diffcult
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half time $=\frac{\ln (2)}{\text { rate constant }}=\frac{\ell n (2)}{R / \Delta T_{0}}=\frac{\ell n (2) \Delta T_{0}}{R}$
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