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Which of the following will cool quickly

$(a)\;\text{A polished metallic vessel filled with water at $100^{\circ}$ C} \\(b)\;\text{Polished metallic vessel filled with oilat $100 ^{\circ}C$ } \\(c)\;\text{A blackened metallic vessel filled with water at $100 ^{\circ}C$ } \\(d)\;\text{A blackened metallic versel filled with oil at $100^{\circ}$ C } $
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A blackened metallic versel filled with oil at $100^{\circ}$ as black body radiates more heat
Hence d is the correct answer.
answered Mar 19, 2014 by meena.p
 

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