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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

Aditi Chauhan , 12 Years ago
Grade 10
anser 1 Answers
Simran Bhatia

(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

Last Activity: 12 Years ago
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