Light is used and manipulated to create lasers, holography and fiberoptic telecommunications systems, but it is primarily used in both scientific communities and in the world to make it possible for people to see when the sun is not out or the room is dark. Light is electromagnetic radiation that can be seen by the human's naked eye.Continue Reading
Light transmits both spatial and temporal information. Lights are also the basis for the field of optical communications and optics. The theory of light and its properties can be derived from the classical theory of electromagnetism. This theory describes light as coupled electric and magnetic fields that move through space and travel as a wave. Quantum theory details light as being made up of discrete packets of energy known as photon.
The wave theory of electromagnetism and the quantum theory reveal only one nature of light, but light is a dual nature. In quantum mechanics the wave-particle duality is observed and explained. In the mid-20th century, scientists discovered and wrote a comprehensive theory on light. This theory was known as quantum electrodynamics and it considered to be the complete theory of light according to physicists. This quantum electrodynamics theory is a combination of quantum mechanics, wave electromagnetism and the theory of relativity.Learn more about Optics & Waves
Getting rid of or reducing an echo in a room involves limiting the number of solid surfaces off of which sound waves are able to bounce. This includes installing carpet to rid a room of hard floors or hanging up curtains to prevent as much sound as possible from bouncing off walls.Full Answer >
Most of the ultraviolet rays that hit the Earth come from the sun. However, there are man-made items that give off ultraviolet rays, such as tanning beds, mercury vapor lamps and black lights.Full Answer >
In addition to the role it plays in driving the water cycle and affecting climate and weather, the energy received from the sun also makes possible the process of photosynthesis, which maintains the atmospheric levels of oxygen required for aerobic organisms to exist on Earth. The light energy captured by plants through photosynthesis is also the source of the energy stored in the organic compounds that provide the greater portion of the energy required for multicellular life to continue. The solar energy stored in fossil fuels and released through burning for human use represents another important role played by sunlight.Full Answer >
One of the most common uses of infrared rays is for wireless communication, such as with garage door openers, car-locking systems and handheld remote controls for televisions and other appliances. Since all objects emit some degree of infrared radiation, night-vision devices make use of their sensitivity to infrared rays to capture and transmit images when there is no visible light source. Heat-seeking missiles also rely upon infrared technology to track their targets in passive missile-guidance systems.Full Answer >