Which of the following colors has the longest wavelength in the visible light spectrum?

💡 Solution & Explanation

Red light occupies the upper end of the visible light spectrum, possessing the longest wavelength and lowest frequency among all visible colors, which allows it to travel longer distances through the atmosphere without heavy scattering. Conversely, violet light has the shortest wavelength and highest frequency, making it scatter much more easily according to Rayleigh scattering principles. This optical property explains why warning signals and traffic stoplights utilize red illumination.