Which types of heat transfer involve heat flow from hot objects to colder objects?

A.

convection, conduction, and radiation

B.

convection, but not conduction or radiation

C.

convection and conduction, but not radiation

D.

convection and radiation, but not conduction

Answer: The correct answer is Option A.

Explanation:

Heat transfer is defined as the process in which heat is transferred from high temperature to low temperature to maintain equilibrium.

There are 3 modes by which heat can be transferred, they are:

Conduction: This mode of heat transfer occurs whenever a direct contact between two object happens. Convection: This mode of heat transfer occurs whenever a movement of fluid (liquid or gas) takes place. Radiation: This mode of heat transfer occurs whenever a direct transfer of energy through space happens.

Thus, all these three modes involve the heat flow from hot objects to cold objects.

Hence, the correct answer is Option A.

convection, conduction, and radiation