Wavelengths at the red end of the spectrum are characterized as:

Wavelengths at the red end of the spectrum are characterized as long. In the context of the visible light spectrum, red light has the longest wavelengths, typically ranging from about 620 to 750 nanometers. This property is essential to understanding how light behaves and interacts with various materials, as longer wavelengths tend to have lower energy compared to shorter wavelengths, which can influence phenomena such as color perception and the effects of light in optical devices. The positioning of red light at the longer end of the spectrum is a fundamental aspect of both optics and the study of electromagnetic radiation.