ultraviolet light
| Noun | 1. |  ultraviolet light - radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays |
ultraviolet light
ultraviolet light
[¦əl·trə′vī·lət ′līt]ultraviolet light
An invisible band of radiation at the upper end of the visible light spectrum. With wavelengths from 10 to 400 nm, ultraviolet (UV) starts at the end of visible light and ends at the beginning of X-rays. The primary source of ultraviolet light is the sun, and most of the UV that reaches earth is in the lower-frequency, longer-wavelength Ultraviolet "A" region (see below).Although ultraviolet (UV) light is widely known as a disinfectant, it was also used to erase EPROM chips. After several minutes of exposure to UV light, the chip could be programmed again (see EPROM).
Ultraviolet for Chip Making
For a long time, chip lithography, which exposes the silicon to a pattern of light, has been using 193 nm far ultraviolet (FUV) as the source. However, because light cannot create a pattern smaller than its own wavelength, several photomasks are used, and complex chips require dozens of lithography steps.
After 10 nm process technology came into production, extreme ultraviolet (EUV) in the 13.5 nm range is considered the next-generation light source because its wavelength is closer to the feature size (see process technology).
Wavelength inUltraviolet Region Nanometers (nm) Long Wave "A" UVA 315-400 Medium Wave "B" UVB 280-315 Short Wave "C" UVC 100-280 Near NUV 300-400 Middle MUV 200-300 Far FUV 122-200 Vacuum VUV 10-200 Extreme EUV 10-121 Deep DUV Below 300
 |
| Ultraviolet in the Spectrum |
|---|
| The ultraviolet band comes after visible light and ends at the beginning of X-rays. |
ultraviolet light
ultraviolet light
The segment of the electromagnetic spectrum between 200 and 400 nm, including photons emitted during electronic transition states. UV-C (200–290 nm) is damaging to DNA and amino acids, but is blocked in the stratospheric ozone layer; UV-B (290–320 nm) is partially blocked by the ozone layer; UV-A (320–400 nm) is the least dangerous, but may still be hazardous with photosensitising medications (e.g., tetracyclines, thiazides), and in patients with lupus erythematosus and light sensitivity disorders (e.g., porphyria). UV-A suppresses delayed cutaneous hypersensitivity, causes photoageing and reduces serum carotenoids; the accelerating depletion of the stratospheric ozone is implicated in the increased incidence of cataract, and melanomas.UV light may also damage the less sensitive purines, causing spontaneous depurination, leaving a “naked” deoxyribose residue in the DNA (apurinic sites). Repair of UV-light-induced DNA damage is defective in chromosomal breakage syndromes (e.g., xeroderma pigmentosa and Bloom syndrome). The mutational effect of UV light is not due to direct DNA damage, but rather occurs during the error-prone process of DNA repair.
ultraviolet light
Ultraviolet radiation Physics The part of the invisible electromagnetic spectrum below violet, including photons emitted during electronic transition states Wavelength 100-400 nm Public health The electromagnetic spectrum between 200 nm and 400 nm which is emitted by the sun. See SPF, Sunscreen.ultraviolet light
Electromagnetic radiation of shorter wavelengths than visible light but longer wavelength than X-rays. Ultraviolet light is divided into three zones—UVA with wavelengths from 380 to 320 nanometres (billionth of a metre), UVB from 320 nm down to 290 nm and UVC from 290 nm down to one tenth of a nanometre. UVC and most of UVB are absorbed by the ozone layer in the earth's stratosphere. Ultraviolet light causes sunburning and damages the skin's elastic protein, collagen. It is also a major factor in the development of the skin cancers rodent ulcer (BASAL CELL CARCINOMA), MALIGNANT MELANOMA and SQUAMOUS CELL CARCINOMA. It causes PINGUECULA and PTERYGIUM in the eyes.ultraviolet light or ultraviolet radiation (UV)
a type of electromagnetic radiation beyond the wavelength of visible violet light, ranging from 18,000 to 33,000 nm (see ELECTROMAGNETIC SPECTRUM). UV light is not an ionizing radiation like X-RAYS and can only penetrate a few cells. However, it is used as a powerful MUTAGEN of microorganisms to cause the formation of thymine DIMERS in DNA, and can be harmful to the human RETINA. Some organisms can detect UV light (see ENTOMOPHILY). UV is a common cause of skin cancers; see MELANOMA.Ultraviolet (UV) light
Patient discussion about ultraviolet light
Q. what does a sun block cream do? and what are a UV rays?
ultraviolet light
- noun
Synonyms for ultraviolet light
noun radiation lying in the ultraviolet range
Synonyms
- ultraviolet
- ultraviolet illumination
- ultraviolet radiation
- UV
Related Words
- actinic radiation
- actinic ray
- sun-ray
- sunray
- put yourself in their place
- put yourself in their shoes
- put yourself on the line
- put yourself out
- put your shirt on
- put your shirt on something
- put your shoulder to the wheel
- put your skates on
- put your stamp on
- put your stamp on something
- put your tail up
- put your, their, etc. heads together
- put your thinking cap on
- put your thinking caps on
- put your trousers on one leg at a time
- put your trousers on one leg at a time just like everybody else
- put your trousers on one leg at a time just like everyone else
- put your trousers on one leg at a time just like the rest of us
- put your trousers on one leg at a time just like you and i
- put your trust in
- put your trust in god, and keep your powder dry
- put your trust in god, but keep your powder dry
- put your trust in her
- put your trust in him
- put your trust in me