GED Science Practice

In the provided text, what does "radiant heating" involve?

1. Heating a building by radiation from panels containing hot water or electrical heaters

2. Measuring distant objects using microwave radiation

3. An automatic instinctive unlearned reaction to a stimulus

4. Use again after processing

The correct answer is: Heating a building by radiation from panels containing hot water or electrical heaters

Radiant heating involves transferring heat through radiation, which is a method of heat transfer that does not require physical contact or a medium, like air or water, to be effective. In this context, the correct choice describes a system that heats a building by utilizing panels that either contain hot water or electrical components. These panels emit infrared radiation, which warms the surrounding air and surfaces in the room, thereby increasing the overall temperature. This process is distinct from the other options, which discuss different scientific principles or concepts unrelated to heating. For example, measuring distant objects using microwave radiation relates to radar or astronomical observations, while an automatic instinctive reaction pertains to behavioral responses in organisms, and the concept of using something again after processing refers to recycling or reusing materials. Each of these does not align with the context of radiant heating, which focuses on the efficient transfer of heat through radiation to improve indoor comfort.