Question

If we place our hand below a lighted electric bulb. We feel warmer because of :

Answer 1

There are three ways by which heat transfers:

• Conduction: for which the two bodies need to be in contact

• Convection: for which there needs to be a material medium between the two bodies

• 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 D.