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Grade 10Thermal Physics

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

Profile image of Aditi Chauhan
12 Years agoGrade 10
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1 Answer

Profile image of Simran Bhatia
12 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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