Which type of light waves is characterized as long waves?

The characteristic of long waves in the context of light refers to the wavelength of the light waves themselves. In the visible spectrum, light waves have varying wavelengths, and red light has the longest wavelength compared to other colors in this spectrum. Specifically, red light typically has wavelengths that range from approximately 620 to 750 nanometers, making it the color with the longest wavelengths visible to the human eye. This property contributes to red light's position at one end of the visible spectrum, while blue, green, and yellow light all have shorter wavelengths. Therefore, red waves of light are correctly identified as the type characterized by long waves.