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.Know More
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
The frequency of a sound wave determines what people hear as pitch. A higher frequency has a higher pitch, and a lower frequency is heard as a lower pitch. The frequencies that humans can hear range from 20 to 20,000 Hertz.Full Answer >
Gamma rays are used in many different ways; one of the most common uses is inspecting castings and welds for defects that are not visible to the naked eye. Another common use of gamma rays is in the treatment of certain types of cancer.Full Answer >
Gamma rays are used in medical applications to treat cancer and to sterilize equipment. Gamma rays are also used as medical tracers to locate tumors.Full Answer >
Infrared is used for keeping things warm, reading information and checking heat. The uses for infrared technology are so diverse because infrared not only detects heat but produces heat in objects that it strikes.Full Answer >