You don’t need to be well known, have a public profile or have time to spare. We invite you to become a patron because you want to stand by us, to be counted and to add your weight to our foundations. Patron: A patron is someone who wants to attach their name to because they share our values and believe in what we are doing.Join us in one of the following citizenship roles. Your name and email address will be used solely to provide you with information you have specifically requested. Visible light is not the same for all living things.Referring to visible light simply as light is short-hand.This usage is useful because the outer limits of the visible spectrum change under different lighting conditions and for different individuals. Light can be used to mean the range of wavelengths and frequencies between infra-red and ultra-violet.A better term is visible light which refers to the wavelengths that correspond with the colours between red and violet, the visible spectrum. Light can be used to mean the range of wavelengths and frequencies that can be detected by the human eye.A better term is radiant energy or photon energy. Light can be used to mean the whole of the electromagnetic spectrum from radio waves, through visible light to gamma rays.The term light can be used in three different ways:.
Energy (electromagnetic energy) is the radiant energy (light) transported by electromagnetic waves.Visible light is only a very small part of the electromagnetic spectrum.There are no precisely defined boundaries between the bands of electromagnetic radiation in the electromagnetic spectrum.The electromagnetic spectrum includes, in order of increasing frequency and decreasing wavelength: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.Waves with shorter wavelengths have a higher frequency and carry more energy.Waves with longer wavelengths have a lower frequency and carry less energy.Wavelengths range from low energy radio waves through visible light to high energy gamma rays.This diagram shows that the electromagnetic spectrum includes waves with all possible wavelengths of radiation.