A) 5 min
B) more than 5 min
C) less than 5 min
D) less or more than 5 min depending on the nature of liquid
Correct Answer: B
Solution :
According to Newton's law of cooling Rate of cooling \[\propto \] (Average temperature of liquid) Obviously, rate of cooling will be less at low temperature, so more than 5 min will be required to cool from \[{{60}^{o}}C\]to \[{{50}^{o}}C\].
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