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Q.

A body is heated to a temperature of 227oC and allowed to coal in air at 27oC. Initial rate of cooling of the body is 1oC/min⁡ what will be the rate of cooling of the body when its surface temperature is 127oC?

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a

0.320C/min

b

0.420C/min

c

0.24C/min

d

0.680C/min

answer is A.

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Detailed Solution

R∝(T4−T04)⇒R2R1=(T24−T04T14−T04)⇒R2R1=4004−30045004−3004⇒R2=0.320C/min
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