* The speed of light is constant: In a vacuum, the speed of light (c) is a universal constant, approximately 299,792,458 meters per second. This value is independent of the wavelength of light.
* Wavelength and frequency are related: The speed of light is related to the wavelength (λ) and frequency (f) of light by the equation:
c = λ * f
* Different wavelengths, same speed: While different wavelengths correspond to different frequencies, the product of wavelength and frequency always equals the speed of light. Therefore, light rays of different wavelengths, including 4000 Å and 8000 Å, will travel at the same speed.
