Question

If we heat an entire closed room by using a heater, which of the following modes of heat transfer is dominant in this process?

• A. Conduction
• B. Convection
  
• C. Convection and radiation
  
• D. Conduction, convection, and radiation

Answer 1

The correct option is C Convection and radiation


Conduction, convection, and radiation

There are three ways by which heat transfers:

1. Conduction: for which the two bodies need to be in contact
2. Convection: for which there needs to be a material medium between the two bodies
3. Radiation: which occurs if there is a temperature difference, irrespective of whether there is a material medium or not.

In this case, there is a medium between the two. But the two bodies are not in contact.
Hence, there is radiation and convection which matches with option C.