The frequency range of visible light in electromagnetic ...

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The frequency range of visible light in electromagnetic spectrum is

Electromagnetic waves are classified according to their frequency fo, equivalently, based on their wavelength ?? ? "= visible light of the wavelength has a range of wavelengths from ~ 400 nm to ~ 700 Nm. Purple light has a wavelength of ~ 400 Nm and a frequency of ~ 7.5 * 1014 Hz.? ? Red light has a wavelength of ~ 700 Nm and a frequency of ~

4.3 * 1014 Hz. The visible light composes only a small part of the full electromagnetic spectrum. Electromagnetic waves with shorter wavelengths and higher frequencies include ultraviolet light, X-rays and range rays. Electromagnetic waves with longer wavelengths and lower frequencies include infrared light, microwave, and radio and television

waves. Radiation type Range Frequency (Hz) Range of wavelength Gamma-rays Gamma 1020 - 1024 97%) of a mid-range ultraviolet (almost all UVs above 280 nm and the maximum up to 315 nm) is blocked by the ozone layer and as ionizing Short wave UV, it would cause much damage to living organisms if the atmosphere penetrated. After the

atmospheric filter, only 3% about the total solar light energy in Zenith is ultraviolet, and this fraction decreases in other solar corners. Much is close to ultraviolet that does not cause solar burning, but it is still able to cause long-term skin damage and cancer. An even smaller fraction of ultraviolet reaching the ground is responsible for solar burning

and also the formation of vitamin D (peak production that occurs between 295 and 297 nm) in all the bodies that make this vitamin (including humans) . The UV spectrum therefore has many effects, both beneficial and harmful to human health. Transmitted atmospheric: this is a plot of atmospheric opacit? of the earth (opposite of transmittance) to

various wavelengths of electromagnetic radiation, including visible light. The visible light passes relatively without obstacles through the atmosphere in the window ? ? ?,? ". Most UV wavelengths are absorbed from oxygen and ozone into the atmosphere of the earth. Astronomical UV sources must be made from space. The subcategories of UV Solar

UV Radiation light is commonly divided into three regions: UV-A (320 ?,? "400 nm), UV-B (290 ?,?" 320 Nm), and UV-C (220 ?, ? "290 Nm), classified by short-long wavelengths (from small larger energies). Most UV-B and all UV-C is absorbed by ozone molecules (O3) in the upper atmosphere. Of Consequence, 99% of the Del UV radiation reach the

surface of the earth is UV-A. There are other schemes to divide UV in different categories, another municipality is: near Ultravioletto (NUV ? ? ?,? "300-400 Nm), central ultraviolet (MUV ? ? ?,?" 200-300 Nm), Extremely ultraviolet (FUV ? ? ?,? "200-122 nm) and extreme ultraviolet (EUV- 121-10 NM). Harmful effects A overexposure to UVB

radiation can cause sunshine and some forms of skin cancer. In humans, The prolonged exposure to the solar UV radiation can lead to acute and chronic health effects on the skin, eyes and immune system. Furthermore, UVC can cause adverse effects that can be varied mutagenic or carcinogens. UV Mutation DNA: ultraviolet photons damage the

DNA molecules of living organisms in different ways. In a common damage event, bases of adjacent tymine links one with each other, instead of through ? ? ?,? ? "Ladder. ? ? ?,?" " DIMERING DIMER? ? ?,? makes a swelling and the distorted DNA molecule does not work properly . The International Health Organization Cancer Research Agency

has classified all the categories and wavelengths of ultraviolet radiation as group carcinogen 1. This is the highest level designation for carcinogens and means that " It is a sufficient proof to conclude that it can cause cancer in humans. ? ? ?,? beneficial effects UVB exposure induces the production of vitamin D in the skin. Most of the positive health

effects are linked to this vitamin. It has regulatory roles in calcium metabolism (which is vital for normal functioning of the nervous system, as well as for bone growth and maintenance of bone density), immunity, cell proliferation, insulin secretion and the Blood pressure. X-rays are electromagnetic waves with wavelengths in the range from 0.01 to

10 nanometers and energies in the range of 100 EV to 100 Kev. Distinguish two categories X-rays and their biological effects Takeaways Takeaways key points X-rays have brief wavelengths (higher energy) than UV waves and, generally, longer wavelengths (lower energy) than gamma rays. Sometimes X-rays are called R??NTGEN RADIATIONS, after

WILHELM R??NTGEN, which is usually credited as their discoverer. As X-rays have very high energy are known as ionizing radiation and can damage living tissue. A very high radiation dose on a short amount of time causes radiation disease, while lower doses can increase radiation-induced cancer risk. The lower doses of X-ray radiation can be used

very effectively in medical radiography and X-ray spectroscopy. In the case of medical radiography, the benefits of X-ray use for the exam far exceed the risk. X-rays are divided into two extensive categories: X-Rays with energy over 5-10 KEV (lower than 0.2-0.1 Nm wavelength) and soft x-rays with energy 100 ev ? ? ?, ? "5 Kev (10 ? ? ?,?" 0.1 NM

wavelength). Hard X-rays are more useful for radiographs because they pass through the fabric. The distinction between radiographs and gamma rays is a bit arbitrary and there is a considerable overlap to the border of high energy. However, in general they are distinguished by their source, with range rays originating from the core and x-rays from

electrons in the atom. Key terms X-ray spectroscopy: use of an X-ray spectrometer for chemical analysis. X-ray crystallography: a technique in which the models formed by X-ray diffraction on passage through a crystalline substance make information about the structure of the crystal lattice and the molecular structure of the substance. X-ray: an

image, often a photographic negative, produced by other than normal light; Especially a X-ray photograph. X-rays are electromagnetic waves with wavelengths in the range from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 PetaHertz at 30 Exahertz (3- 1016 Hz at 37 Hz) and energies In the range 100 EV to 100 Kev. They are

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