A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( T is temperature of the block and t is the time.)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
From the Newton's law of cooling is given by
Here, 
proportionality constant
Hence, the graph as shown below, shows temperature of a body (done) varies exponentially with time from 
to 
.
Thus, the correct option is
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