Final answer:
Blue is the color among those listed with the shortest wavelength in the visible spectrum. As wavelengths decrease from red to blue, the frequency increases, such that blue has a higher frequency than yellow and red.
Step-by-step explanation:
Of the colors listed (red, green, blue, yellow), the color blue is associated with the shortest wavelength. In the visible spectrum, the wavelengths decrease from red to violet. This means that as we move from red through yellow and green to blue, the wavelengths get shorter, and therefore the frequency of the light waves increases. According to the physics of light, Figure 8.12 and Figure 12.13 state that violet has the shortest wavelength and carries the most energy, while red has the longest wavelength and the least energy. Since blue is closer to violet, it will have a shorter wavelength than green, yellow, and red.
In summary, using the provided information as a reference: Part A's correct order of wavelengths from shortest to longest would be blue, yellow, red; Part B's correct order of frequencies from lowest to highest would be the reverse: red, yellow, blue. This is because wavelength and frequency are inversely related.