Question

Fill in the blanks.

The heat from the sun's rays reaches us by ________________.

Answer 1

1. Most of the space between the sun and the earth is the vacuum.
2. This means that there is no material medium between them.
3. The methods of heat transfer of conduction and convection require a medium for the transfer of heat.
4. So, the heat from the sun reaches the earth through radiation.
5. Radiation is the mode of heat transfer that takes place without any need for a material medium.
6. In this method, heat travels in the form of electromagnetic radiation.

Thus, the heat from the sun's rays reaches us by radiation.