Q.

Heat from the Sun reaches the Earth by

A. Reflection
B. Conduction
C. Radiation
D. Convection
Answer» C. Radiation
Explanation: The radiation (light, heat, etc.) travels through the intervening 150,000,000 kilometers in 8 minutes. Radiation is a process in which energetic particles or energetic waves travel through vacuum, or through mattercontaining media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of "radiation" in this sense.
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