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A body is heated to a temperature of $227^{o} C$ and allowed to coal in air at $27^{o} C$ . Initial rate of cooling of the body is $1^{o} C / \min$ what will be the rate of cooling of the body when its surface temperature is $127^{o} C$ ?

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0.320C/min

0.420C/min

0.24C/min

0.680C/min

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detailed solution

Correct option is A

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

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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 body is heated to a temperature of $227^{o} C$ and allowed to coal in air at $27^{o} C$ . Initial rate of cooling of the body is $1^{o} C / \min$ what will be the rate of cooling of the body when its surface temperature is $127^{o} C$ ?