Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, Which of the following observations is correct
The two kettles will cool down at the same rate
the polished kettle cools down more quickly by conduction
the kettle covered with soot cools down more quickly because it is a good radiator
the kettle covered with soot cools down more quickly by the process of heat convection
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The correct answer is C.
C — the kettle covered with soot cools down more quickly because it is a good radiator.
Explanation
Heat can be lost by conduction, convection, and radiation.
Polished surfaces are poor emitters (radiators) of heat.
Black or dull surfaces (like soot) are good emitters (radiators) of heat.
Since the kettle covered with soot is black, it radiates heat faster to the surroundings. Therefore, the water in it loses heat more quickly and cools faster.
the correct answer is B.
the sooth acts as an insulator so the kettle with sooth will hold heat longer
The colour black is a good absorber of heat but white is a good radiator of heat so there for the polished kettle will cool down more quickly by conduction-B
