To solve this question, we need to understand the concept of heat transfer and the factors that affect thermal comfort.
The correct answer is C. More heat is lost by convection and radiation while in motion.
Explanation for each option:
A. An object in motion captures less solar radiation: This option is incorrect because the amount of solar radiation captured by an object does not depend on its motion. Solar radiation is absorbed by objects regardless of whether they are stationary or in motion.
B. Air is transparent to radiation and hence it is cooler than the body: This option is not the best explanation for why a scooter rider feels more comfortable while on the move. While air may be transparent to radiation, it does not necessarily mean that the air is cooler than the body. Temperature is not solely determined by transparency to radiation.
C. More heat is lost by convection and radiation while in motion: This is the correct explanation. When a scooter is in motion, there is airflow around the rider, which increases the rate of heat transfer by convection. Additionally, the rider is exposed to a larger surface area, allowing for more heat to be lost through radiation. This increased heat transfer helps to dissipate the excess heat generated by the body and provides a cooling effect, making the rider feel more comfortable.
D. Air has a low specific heat, and hence it is cooler: This option is incorrect because the specific heat of air does not determine its temperature. Specific heat refers to the amount of heat required to raise the temperature of a substance by a certain amount. It does not indicate that air is inherently cooler.
Therefore, the correct explanation for why a scooter rider feels more comfortable while on the move is option C: more heat is lost by convection and radiation while in motion.