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A body cools from 50.0°C to 49.9°C in 5s. How long win it take to cool from 40.0°C to 39.9°C? Assume the temperature of surroundings to be 30.0°C and Newtons law of cooling to be valid. (a) 2.5 s (b) 10 s (c) 20 s (d) 5 s



A body cools from 50.0°C to 49.9°C in 5s. How long win it take to cool from 40.0°C to 39.9°C? Assume the temperature of surroundings to be 30.0°C and Newtons law of cooling to be valid.


        (a)    2.5 s


        (b)    10 s


        (c)    20 s


(d)    5 s


Grade:10

1 Answers

Simran Bhatia
348 Points
7 years ago

(b)

Rate of cooling is proportional temperature difference between system and surrounding. 

As the temperature difference is halved, so the rate of cooling will also be halved

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