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Question

If we place our hand below a lighted electric bulb. We feel warmer because of :
convection
radiation
conduction
both A and B

A

convection

B

conduction

C

both A and B

D

radiation

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Solution

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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.

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