Do photons have the same frequency in Ultraviolet light?
The speed of light and, thus, photons is constant in any given medium. The speed of photons is greatest in a vacuum or free-space but less in air and water etc. The wavelength of a photon ‘λ’ times its frequency ‘f’ gives its speed ‘c’: – c= λ.f The frequency of light photons and all electromagnetic photons varies with their energy ‘E’ such that: – f = E/h Where ‘h’ is Planck’s constant. Infrared light and red light is less energetic than violet or ultraviolet light and so ultraviolet light has a higher frequency, from: – E = hf but ultraviolet light has a shorter wavelength, than red light, because the product wavelength times frequency must equal the speed of light for a photon in its given medium (space, air, glass, water, etc.).
