A) The same 4 minutes
B) More than 4 minutes
C) Less than 4 minutes
D) We cannot say definitely
Correct Answer: B
Solution :
Rate of cooling \[=\frac{-d\theta }{dt}\propto \left( \frac{{{\theta }_{1}}+{{\theta }_{2}}}{2}-{{\theta }_{0}} \right)\] In second case average temperature will be less hence rate of cooling will be less. Therefore time taken will be more than 4 minutes.
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