Dictionary > Ultraviolet ray

Ultraviolet ray

Definition
noun, plural: ultraviolet rays
A ray characterized generally by a wavelength between 10 nm to about 400 nm
Supplement
The electromagnetic spectrum pertains to the entire range of wavelengths of electromagnetic radiation. It includes gamma rays, X-rays, UV, visible light, infrared, microwaves, and radio waves. The ultraviolet (UV) rays have wavelengths ranging from about 10 nm to about 400 nm. They are that portion of the electromagnetic spectrum immediately below the visible range and extending into the X-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays. The shorter, ionizing wavelengths (far-uv or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.
UV radiation have many subtypes: ultraviolet A, ultraviolet B, ultraviolet C, near ultraviolet, middle ultraviolet, far ultraviolet, hydrogen lyman-alpha, vacuum ultraviolet, and extreme ultraviolet. Ultraviolet A, for instance, is ultraviolet radiation from 315 to 400 nm. It causes skin tanning but is very weakly sunburn-producing and carcinogenic. Ultraviolet B is an ultraviolet radiation from 280 to 315 nm that most effectively causes sun burning and tanning. Therefore, excessive uVB exposure is capable of causing cancer of fair skin.
Abbreviation / Acronym:

  • UV ray

See also:

  • electromagnetic radiation
  • Extravital ultraviolet
  • Ultraviolet lamp
  • Ultraviolet a
  • Ultraviolet b
  • Ultraviolet c
  • Ultraviolet microscope
  • Ultraviolet radiation


    You will also like...

    Biological Cell schematic diagram
    Biological Cell Introduction

    It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..

    Genetics and Evolution
    Genetics and Evolution

    Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..

    Adaptation Tutorial
    Adaptation Tutorial

    Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

    Homeostasis by water regulation
    Homeostasis of Organism Water Regulation

    Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water..

    Birth Control and Contraception
    Birth Control and Contraception

    Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

    Still freshwater and plants
    Still Freshwater & Plants

    Plants in lentic habitats have features not found in terrestrial plants. They acquired these features as they adapt to t..