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...

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

Answer Details

The correct observation is: the kettle covered with soot cools down more quickly because it is a good radiator. The process by which a body loses heat to its surroundings is known as radiation, convection or conduction. The surface of the kettle covered with soot is rough and black, and it has a high emissivity that allows it to radiate more heat to its surroundings compared to the highly polished surface of the other kettle. This causes the kettle covered with soot to cool down faster than the polished one.