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Question

When placed in air at 30 C, the temperature of a body decreases from 60 C to 50 C in ten minutes. After next ten minutes, its temperature will be-

A
Less than 40 C
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B
40 C
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C
More than 40 C
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D
Not definite
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Solution

The correct option is C More than 40 C
From Newton's law of cooling.
dTdt=k[Tavg.Ts]
rate of cooling rate of temperature difference
As Tavg. in Case- I > Tavg. in Case - II
Hence, temperature will become more than 40 in next 10 minutes.

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