Question

In which of the following cases mode of heat transfer is radiation ?

• A. Boiling water by thrusting a red-hot piece of iron into it
• B. Hot air rising
• C. Heat from the sun warming your face
• D. none of these

Answer 1

The correct option is C

Heat from the sun warming your face

In radiation, heat is transferred in the form of electromagnetic radiation, through the medium.
We know that space is a vacuum and also that the electromagnetic radiations can pass through a vacuum. Hence clearly, the sun's heat reaches the earth through the process of radiation.

Hence, option $\left(c\right)$ is the correct answer.