In Vain Red Orange Yellow Green Blue Indigo Violet Different colours have different wavelengths.
Red light has the lowest amont of energy and the longext wavelength.
Infra-red light has less energy and a longer wavelength than ordinary red light. However you can feel IR light on your skin because it warms you up. Violet light has the highest amount of energy and the shortest wavelength. Ultra-violet light has even more energy and a shorter wavelength. UV light cannot be seen but it will give you sunburn and could give you skin cancer.