A) Heat transfer by conduction and convection require a material medium.

B) Heat transfer by radiation doesn't require a material medium.

Q. Heat transfer by raditaion does not require a material medium.

Q. Which of the following statement(s) is/ are true about convection?
1. Convection requires a material medium for the transfer of heat.
2. In liquids, the predominant mode of heat transfer is convection.
3. In convection, heat flows from the cold end to the hot end of the substance.

Q. Which of the following statements is/are true with respect to conduction?
1. Conduction is a process in which particles move from the hot region to the cold region.
2. Conduction is a process in which paricles vibrate about their mean position to transfer energy.
3. Conduction does not require material medium for the transfer of energy.
4. Conduction is the prominent mode of heat transfer in solids.

Q. Which of these does not require a medium–conduction, convection or radiation?

Q.

The transfer of heat by radiation does not require ​any medium.​