Quote:
Originally Posted by Saqiyasi
-convection is the right answer coz radiation onli takes place where dere is no medium ..
-and conduction onli takes place onli in solids ..
-covection needs sum fluid to transfer heat. So in dis case , air acts as a fluid
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Please note convection takes place in liquids, conduction takes place in solids and gases where as radiation phenomenon in which radiant energy is released is only observe if the pot containing water is heated to an extent so that it start glowing and emit light which is actually the radiant energy(e.g of radiation phenomenon is SUN emitting heat waves and if an IRON piece is put on fire for a long time so it gets really hot and emit radiation).
The answer of this very first MCQ is conduction, reason being that conduction is the gradual transfer of heat from high concentration end to lower concentration end. In this case AIR act as a medium and transfer the heat energy. The physics involve behind is that when water in pot is heated up, the high energy atoms gains energy and releases electron, thus water moecules are converted into vapors, the vapors emnating from the surface of water are hot interact with the atoms of air molecules and air molecues standing at lower energy level gains energy and starts to vibrate, this way the transfer of energy from one air molecule passes to another and spread in the near environment.
I have confirmed this with a Physics professor. Regarding those members who have written Radiation, for them radiation only takes place in electromagnetic range and in this case it is not a valid answer.
Hope this helps clarify the concept behind this tough MCQ.