Final answer:
The labeling of water faucets with red for hot water and blue for cold is consistent with Wien's law, where higher temperatures correspond to shorter wavelengths (red) and lower temperatures to longer wavelengths (blue).
Step-by-step explanation:
Water faucets are typically labeled with a red dot for hot water and a blue dot for cold water. This color-coding does make sense when considering Wien's law, which states that the peak wavelength of thermal radiation emitted by a black body is inversely proportional to its temperature.
Essentially, higher temperatures correspond to shorter wavelengths of light, which are associated with the color red, while lower temperatures correspond to longer wavelengths, which are associated with the color blue. Therefore, the use of red and blue dots accurately represents the concept of temperature in terms of wavelength as described by Wien's law.