Question

Based on the principles of convection, conduction and thermal radiation, which scenario below is most similar to the following situation? You put a heating pad on your back after exercising. A) Feeling a metal wire get warmer as you roast a marshmallow over a fire. B) Warm air rising in a room where the air is moving. C) The sun warming up the roof on a house. D) Cold water sinking in a pot of water being warmed up on the stove.

Answer 1

Answer:

Option A

Explanation:

The answer is option A or "Feeling a metal wire get warmer as you roast a marshmallow over a fire." The example given is a clear example of conduction because its the transfer of the heat from the heating pad to your back after you finish exercising, in option A it is also conduction because its the transfer of heat from the fire to the metal wire you are roasting a marshmallow. The answer isn't option B or option D because these are both convection where warm air rises and cold air sinks. Also the answer isn't option C because this is a example of thermal radiation, which is when the radiation from the sun is increasing the temperature on the roof of the house.

Hope this helps.