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