What is light - Overview of light sources:


Introduction of Light :

Light, or Visible Light, usually refers to the radiation emitted by the human eye. The entire electromagnetic spectrum is extremely wide, ranging from low-frequency Radio waves with wavelengths measured in meters, to high gamma energy rays with wavelengths less than 1 x 10-11 meters. Radiation, as the name suggests, describes a decrease in electrical energy and magnetic field, which carries a Speed ​​of Light (~ 300,000 km / sec per vacuum). 

Light can also be defined by the distribution of photons, light-weight packets, each moving with wavel-like objects at the speed of light. Photon is the smallest amount of energy (quantum) of energy that can be transported, and it was the understanding that light travels in a different quanta that was the basis of Quantum Theory.

Visual light does not differ naturally from other parts of electromagnetic radiation, except that the human eye can detect visible waves . This is actually similar to a very small window of electric spectrum, ranging from 400nm in violet light to 700nm in red light. Radiation less than 400nm is called Ultra-Violet (UV) and radiation longer than 700nm is called Infra-Red (IR), which is not visible to human eyes.

 However, high-tech scientific devices, such as the one made by Andor, can be used to detect and measure photons at a much wider range of the electromagnetic spectrum , and to decrease and decrease the amount of photon (meaning light at very low) than can detect.

How does light relate to the issue?

It is not dangerous for people to be able to ‘see’ the light. Light is our primary means of seeing the world around us. Indeed, in a scientific sense, the discovery of light is a powerful tool for exploring the universe around us. Since the light associated with the matter can be changed, and by reading the light that initiated or shared the matter, many of the structures of that matter can be determined. It is the study of light where, for example, we can understand the formation of stars and galaxies with years of light or real-time observations of the smallest physical processes that take place within living cells.

A story is made up of atoms, ions, or molecules, and it is their interaction with light that brings about a variety of events that can help us to understand the story. Atoms, ions, or molecules define energy levels, often associated with energy levels that electrons can capture. Light is sometimes produced by matter, or in general, photon of light can interact with energy levels in many ways.

Concept of Light
Energy Level 

We can represent the energy levels of matter in a scheme known as the Jablonski diagram, represented in Figure 2. An atom or molecule with the lowest possible energy, known as the ground state, can take a photon that will allow an atom or molecule to be elevated to a higher energy level, known as as a happy world. So this story can get you the light of the average length. An atom or a molecule remains in a state of bliss for a very short time and returns to the ground state through many processes. 

Related Topics :

In the example shown, an atom or a happy molecule initially loses energy, not by releasing a photon, but by returning to a low-energy state through internal processes that normally heat the matter. The median energy level then degrades to the earth's surface by emitting a lower energy photon (longer wavelength) than the original photon.

How do we read a story using light?

As photonons absorbed or emitted by a subject will become stronger, when the light interacted with the subject is divided into its own wavelengths using a spectrograph, the emerging spectral signature tells us a great deal about the subject itself. 

The broad spectroscopy field develops a wide range of visual techniques, such as raman spectroscopy, absorption / transmission / reflection spectroscopy, atomic spectroscopy, laser by decomposing spectroscopy (LIBS) and temporary absorption spectroscopy , which provides a wealth of useful information on the scientific structures of atoms and molecules, as well as the ability to accurately identify the presence and estimate of the number of such substances in a sample.

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