Q.

body cools from 50°C to 49°C in 5 s. How long will it take to cool from 40°C to 39°C? Assume temperature of surroundings to be 30°C and Newton's law of cooling is valid:

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a

2.5 s

b

10 s

c

20 s

d

5 s

answer is B.

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Detailed Solution

θ1-θ2t=Kθ1+θ22-θ0
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body cools from 50°C to 49°C in 5 s. How long will it take to cool from 40°C to 39°C? Assume temperature of surroundings to be 30°C and Newton's law of cooling is valid: