When placed in air at 30∘C, the temperature of a body decreases from 60∘Cto50∘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.