There is a range of wavelengths for visible light. Violet is at the short wavelength end of the range(about 400 nm) and Red is at the long wavelength end of the range(about 600 nm). Yellow is in the middle with a wavelength of about 500 nanometers . That would be .0000005 meters. read more
Wavelength of Ultraviolet Light: Ultraviolet light belongs to electromagnetic spectrum and it extends from end of visible region and x-rays. Ultraviolet light is in the range of 10 nm to 400 nm with energies from 3eV to 124 eV. read more