What is ultraviolet light used for by humans?
What is UV light Wikipedia?
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays. ... Short-wave ultraviolet light damages DNA and sterilizes surfaces with which it comes into contact.
What is ultraviolet light in simple words?
Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the "electromagnetic spectrum". Radiated energy, or radiation, is given off by many objects: a light bulb, a crackling fire, and stars are some examples of objects which emit radiation.
What is important about ultraviolet light?
Some UV radiation is essential to the body as it stimulates the production of vitamin D. Vitamin D has an important function in increasing calcium and phosphorus absorption from food and plays a crucial role in skeletal development, immune function and blood cell formation.Oct 16, 2017
Is ultraviolet harmful?
UV exposure increases the risk of potentially blinding eye diseases, if eye protection is not used. Overexposure to UV radiation can lead to serious health issues, including cancer. Skin cancer is the most common cancer in the United States.
How do you make an ultraviolet light?
UV radiation is produced either by heating a body to an incandescent temperature, as is the case with solar UV, or by passing an electric current through a gas, usually vaporized mercury. The latter process is the mechanism whereby UV radiation is produced artificially.
What is the range of UV?
The UV region covers the wavelength range 100-400 nm and is divided into three bands: UVA (315-400 nm) UVB (280-315 nm) UVC (100-280 nm).Mar 9, 2016
How does UV light create ozone?
A UV lamp “tuned” to 185nm can create ozone from oxygen (O2) by disrupting the O2 molecule and splitting it into two oxygen atoms. These two oxygen atoms attempt to attach to other oxygen molecules (O2). It is the attachment of this third oxygen atom that creates ozone (O3).Jun 1, 2020
What is UV light frequency?
Ultraviolet radiation oscillates at rates between about 800 terahertz (THz or 1012 hertz) and 30,000 THz. When we talk about visible light, we refer to the different wavelengths of light across the visible spectrum by the names of colors.
Is sunlight a UV light?
Sunlight. Sunlight is the main source of UV radiation, even though UV rays make up only a small portion of the sun's rays. Different types of UV rays reach the ground in different amounts. About 95% of the UV rays from the sun that reach the ground are UVA rays, with the remaining 5% being UVB rays.Jul 10, 2019
Can humans see UV light?
The human retina is sensitive to the ultraviolet (UV) spectrum down to about 300 nanometres, but the lens of the eye filters it out. ... But people born without a lens, or who have a lens removed and not replaced, sometimes report seeing ultraviolet as a whitish-violet light.Dec 4, 2019
Is ultraviolet helpful or harmful?
Radiation at the longer UV wavelengths of 320-400 nm, called UV-A, plays a helpful and essential role in formation of Vitamin D by the skin, and plays a harmful role in that it causes sunburn on human skin and cataracts in our eyes.Sep 6, 2001
Does UV light produce heat?
No. The light source may get warm or even hot, but UV light does not transmit heat. Heat is transmitted in the lower frequencies of Infrared (IR). Heat sources emit IR and that can be measured/seen using IR camera or IR sensor.
What are facts about UV light?
- Ultraviolet Light - 10 Interesting Facts! UV light lies in the invisible spectrum hence the name ‘black light’. UV light is usually invisible, but depending on the conditions it can sometimes be seen down to about 310nm. UVA (315 – 400nm) is commonly used for tanning, aquarium lighting, inspection equipment, glow lights, entertainment uses etc.
What is ultraviolet light used for?
- | Ultraviolet.com) Ultraviolet is used in fluorescent lights and LED lighting - the light source actually emits ultraviolet, which is converted to visible light by phosphors. It is also used in tanning lamps, to sterilize water and other items, and as a photocatalyst.
What are the hazards of UV light?
- Hazards of Ultraviolet Radiation. Ultraviolet (UV) radiation is electromagnetic energy with a wavelength just shorter than that of visible light. UV energy stimulates vitamin D production in our bodies and is a treatment for psoriasis, but can also cause skin cancer, sunburns and cataracts.
What is the definition of ultraviolet light?
- Ultraviolet Light. Definition - What does Ultraviolet Light mean? Ultraviolet Light, also known as UV light, is a form of radiation which is emitted as radio waves, X-rays, infrared rays, or gamma rays. It is electromagnetic and cannot be seen by the human eye. This light is a part of the electromagnetic spectrum.