Light is a form of energy produced by many chemical reactions. The sun and other stars produce huge amounts of heat and light through fusion and are the source of most visible light in the universe. Other reactions that produce light are combustion and chemoluminescence.Know More
The basic unit of light is called a photon and can act as both a particle and a wave. Photons are produced when a reaction causes an electron to move from a higher nuclear orbital to a lower one, releasing energy in the process. Light energy and heat energy are often produced in the same reactions. Because of a principle called black-body radiation, some substances emit visible light at high temperatures, which is why very hot metal glows red or white.
Sunlight takes a little more than eight minutes to travel from the Sun to Earth, and the power of sunlight is roughly 120 watts per square meter on Earth. The Sun produces ultraviolet and infrared light in addition to the visible spectrum. Ultraviolet light has a shorter wavelength than visible light and causes sunburns, while infrared light has a longer wavelength and is used in night vision devices.
The candela measures wattage over an area and is the official unit of light intensity. An average candle has one candela of luminous intensity.Learn more about Optics & Waves
Light is created when electrons orbiting an atom become energized to move into a higher orbit, and then drop down to a lower orbit, releasing a small amount of energy in the process. This energy is called a photon, which is the fundamental particle of light.Full Answer >
Light energy is a type of kinetic energy with the ability to form types of light people can see as well as invisible waves. Light is a form of electromagnetic radiation, and hot objects, such as light bulbs, the sun and lasers, emit it.Full Answer >
Of the visible light spectrum, violet waves have the most energy. The visible violet light's wavelength measures at 400 nanometers.Full Answer >
Light energy refers to the energy carried by waves in the visible region of the electromagnetic (EM) spectrum. The EM spectrum is comprised of the entire range of electromagnetic radiation from radio waves all they way up to gamma rays.Full Answer >