Four metal cans are identical except for the colour and texture of their outer surfaces. $100 c m^{3}$ of water at $70^{\circ} C$ is poured into each can. Which can cool most rapidly ?

P

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Q

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R

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S

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Solution

The correct option is A $P$
Answer is A.

Black surfaces are the best emitters and abosrbers of heat radiation and shiny surfaces are the poor abosrbers of heat radiation.
Therefore, The can that is black and has rough surface will radiate heat faster and hence, the water in can P will cool down most rapidly.

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Four metal cans are identical except for the colour and texture of their outer surfaces. 100cm3 of water at 70∘C is poured into each can. Which can cool most rapidly ?

Four metal cans are identical except for the colour and texture of their outer surfaces. $100 c m^{3}$ of water at $70^{\circ} C$ is poured into each can. Which can cool most rapidly ?