Lightning Silhouette PNG Transparent Images

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License Info: Creative Commons 4.0 BY-NC


Uploaded on on Sep 5, 2021

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Light, often known as visible light, is electromagnetic radiation that is visible to the naked eye. Between the infrared (longer wavelengths) and ultraviolet (shorter wavelengths), visible light has wavelengths in the range of 400″700 nanometres (nm) (with shorter wavelengths). The frequency range at this wavelength is around 430″750 terahertz (THz).

Intensity, propagation direction, frequency or wavelength spectrum, and polarisation are the four fundamental characteristics of visible light. Light moves at 299 792 458 meters per second (m/s) in a vacuum, which is one of nature’s fundamental constants. Like all kinds of electromagnetic radiation (EMR), light is found to constantly move at this speed in a vacuum under experimental circumstances.

The term ‘light’ is occasionally used in physics to refer to electromagnetic radiation of any wavelength, visible or not, regardless of wavelength. Gamma rays, X-rays, microwaves, and radio waves are all considered to be light in this sense. Visible light travels in waves, like all other forms of electromagnetic energy. The energy transmitted by the waves, on the other hand, is absorbed in discrete areas, similar to how particles are absorbed. A photon is a unit of light that represents the absorbed energy of electromagnetic waves. When a wave of light is converted and absorbed as a photon, the wave’s energy collapses to a single place, and the photon “arrives” at that location. The wave function collapse is what is referred to as this. The wave-particle duality refers to light’s dual nature of being both a wave and a particle. Optics, or the study of light, is a key field of modern physics research.

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On Earth, the Sun is the major source of light. From prehistoric campfires to modern kerosene lamps, fire has been an essential source of illumination for people throughout history. Electric illumination has effectively supplanted firelight as a result of advancements in lighting and power systems.

Radio waves, microwaves, infrared, the visible spectrum that humans see as light, ultraviolet, X-rays, and gamma rays are all types of EM radiation (the term “radiation” excludes static electric, magnetic, and near field forces).

EMR has a wavelength that determines how it behaves. Shorter wavelengths are associated with higher frequencies, whereas longer wavelengths are associated with lower frequencies”the amount of energy per quantum carried by EMR influences how it interacts with single atoms and molecules.

EMR in visible light consists of quanta (called photons) that are at the lower end of the energies capable of generating electronic excitation within molecules, resulting in changes in the molecule’s bonding or chemistry. Because its photons no longer have enough individual energy to cause a lasting molecular change (a change in conformation) in the visual molecule retinal in the human retina at the lower end of the visible light spectrum (infrared), EMR becomes invisible to humans (infrared). This change triggers the sensation of vision.

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