Consider the following physical cases. Choose the letter that correctly matches each roman numeral with the appropriate heat transport mechanism. ⦁ A young boy who jumps into a swimming pool feels cooler than the surroundings. ⦁ On a freezing day, a gas station attendant finds the metal handle to a gasoline pump intolerably cold to grip. ⦁ A camper gets warm in from of a campfire. ⦁ I. Convection II. Conduction III. Radiation ⦁ I. Conduction II. Radiation III. Convection ⦁ I. Radiation II. Convection III. Conduction ⦁ I. Conduction II. Convection III. Radiation ⦁ I. Radiation II. Conduction II. Convection

The correct answer is

I Convection  II conduction. III Radiation

Here we are looking at the means of heat transfer due to which the pool gets colder than the surrounding. Basically the pool water gets cold due to convection of heat transfer from atmosphere. As the specific capacity of water is more than air so it losses the heat slowly. During night when temp goes down due to convection current the pool gets cold.

Then the second case when the metal handle of gasoline pump becomes very cold that is because of conduction as the metal handle is directly in contact with the cold air. As the specific heat capacity of the metal is more than air so it losses the temperature slowly.

The camper gets warm due to campfire is due to radiation. Here the heat which enters the camper due to radiation is not able to escape due to closed area so heat is retained inside.