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Q.

A bucket full of hot water cools from 75oC to 70oC in time T1 from 70oC to 65oC in time T2 and from 65oC to 60oC in time T3, then

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a

T1=T2=T3

b

T1>T2>T3

c

T1

d

T1>T2

answer is C.

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Detailed Solution

According to Newton's law of cooling the rate of cooling depends upon the difference of temperature between the body and the surrounding. It means that when the difference of temperature between the body and the surrounding is small, time required for same fall in temperature is more in comparison with the same fall at higher temperature difference between the body and surrounding. So according to problem T1
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A bucket full of hot water cools from 75oC to 70oC in time T1 from 70oC to 65oC in time T2 and from 65oC to 60oC in time T3, then