Which of the following colours has the longest wavelength?

Explanation

Among the options provided—Violet, Yellow, Red, and White—Red has the longest wavelength. In the visible light spectrum, red light wavelengths range from approximately 625 to 740 nanometers (nm). In contrast, violet light has wavelengths between 380 and 450 nm, and yellow light ranges from 565 to 590 nm. White light is not a single wavelength but a combination of all visible wavelengths.