Final answer:
Red light has the lowest frequency in the spectrum, characterized by its long wavelength, while violet has the highest frequency and shortest wavelength.
Step-by-step explanation:
The colour of the spectrum with the lowest frequency is red light. This portion of the spectrum is characterized by the longest wavelengths when compared to other colors in the visible spectrum. In contrast, violet light has the highest frequencies and shortest wavelengths. The sunlight we perceive is influenced by this spectrum, with blackbody radiation from the Sun being more intense at the red end, giving it a yellowish appearance. The visible light wavelengths range from about 400 nm (violet) to 750 nm (red), with corresponding frequencies thus spanning from approximately 4.0 × 10ⁱ⁴ s⁻¹ to 7.9 x 10ⁱ⁴ s⁻¹ in that spectrum.