Light (2022) Time AntiTime

Light. The Light we see is the part of the electromagnetic radiation that is The visible Light spectrum, which is that which can be perceived by the human eye. Scientists say that visible light usually has wavelengths in the range of 400–700 nanometers, corresponding to frequencies of 750–420 terahertz, between infrared and ultraviolet. In physics, the term "light" may refer more broadly to the electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. The primary properties of light are intensity, propagation direction, frequency, wavelength, spectrum and polarization. Like all types of electromagnetic radiation, visible light propagates by massless elementary particles called photons that represent the quanta of an electromagnetic field, and can be analyzed as both waves and particles. Our star, Sol, which we commonly know as, “The Sun,” is our main source for light and heat on planet Earth. Generally, electromagnetic radiation is classified by wavelength into radio waves, microwaves, infrared, the visible spectrum that we perceive as light, ultraviolet, X-rays and gamma rays. The designation "radiation" excludes static electricity, magnetic and near fields. The behavior of electromagnetic radiation depends on its wavelength. Higher frequencies have shorter wavelengths and lower frequencies have longer wavelengths. When electromagnetic radiation interacts with single atoms and molecules, its behavior depends on the amount of energy per quantum that it carries. ElectroMagnetic Radiation in the visible light spectrum consists of quanta or photons at the lower end of the energies. Photons are capable of causing electronic excitation within molecules, which leads to changes in the bonding or chemistry of the molecule. At the lower end of the visible light spectrum, ElectroMagnetic Radiation becomes invisible to humans at the infrared band. Infrared photons no longer have enough individual energy to cause a lasting molecular change in the visual molecule, retinal in the human retina, which when changed triggers the sensation of vision. There are animals that are sensitive to various types of infrared, but not by means of quantum-absorption. It depends on a kind of natural thermal imaging, in which tiny packets of cellular water are raised in temperature by the infrared radiation. Above the range of visible light, ultraviolet light becomes invisible to humans, mostly because it is absorbed by the cornea below 360 nanometers and the internal lens below 400 nanometers. The rods and cones located in the retina of the human eye cannot detect the very short ultraviolet wavelengths and are damaged by ultraviolet. Animals with eyes that do not require lenses such as insects and shrimp are able to detect ultraviolet, by quantum photon-absorption mechanisms, in much the same chemical way that humans detect visible light. Various sources define visible light as narrowly as