What is UV radiation quizlet?

Terms in this set (37)

ultraviolet radiation. electromagnetic radiation with wavelengths between that of visible light and x-rays. classification. modality that emits electromagnetic radiation. wavelength - 400 nm and below 290.

What is UV radiation in biology?

(UL-truh-VY-oh-let RAY-dee-AY-shun) Invisible rays that are part of the energy that comes from the sun. Ultraviolet radiation that reaches the Earth's surface is made up of two types of rays, called UVA and UVB. Ultraviolet radiation also comes from sun lamps and tanning beds.

What is ultraviolet radiation answer?

In scientific terms, UV radiation is electromagnetic radiation just like visible light, radar signals and radio broadcast signals (see Figure 1). Electromagnetic radiation is transmitted in the form of waves.

What are 3 types of UV radiation quizlet?

What is UV radiation definition for kids?

Ultraviolet rays are short light waves produced by the sun, and there are three types of ultraviolet rays. Most people are exposed to UV-A rays, and the Earth's atmosphere absorbs most harmful UV-B and UV-C rays. The concept of ultraviolet light was discovered by Johann Ritter in the early 1800s.

UV radiation

What are UV rays and why are they harmful?

UV rays, either from the sun or from artificial sources like tanning beds, can cause sunburn. Exposure to UV rays can cause premature aging of the skin and signs of sun damage such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis. UV rays can also cause eye problems.

What is UV light made of?

A UV lamp is different from a regular lamp because it's typically made of quartz instead of glass. Inside, there is an inert gas mixed with mercury. When the lamp is plugged in, electricity reacts with the mercury, and the lamp produces UV light. The type of UV light emitted depends on the pressure inside the lamp.

What are the 3 types of UV radiation?

What are the different types of UV radiation rays? UV radiation is classified into three primary types: ultraviolet A (UVA), ultraviolet B (UVB), and ultraviolet C (UVC). These groups are based on the measure of their wavelength, which is measured in nanometers (nm= 0.000000001 meters or 1×10-9 meters).

What does UV radiation do to cells?

Ultraviolet (UV) light kills cells by damaging their DNA. The light initiates a reaction between two molecules of thymine, one of the bases that make up DNA.

Where can UV rays be found?

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.

How are UV rays produced?

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 color is UV light?

UV light has a shorter wavelength than visible light. Purple and violet light have shorter wavelengths than other colors of light, and ultraviolet has even shorter waves than violet does; so ultraviolet is sort of "purpler-than-purple" light or "beyond violet" light.

What does UV look like?

Unlike the royal look of Pantone's 2018 selection, a true ultraviolet light looks more like a whitish blue or violet, according to those with the condition.

What is UV rays in chemistry?

Ultraviolet radiation is electromagnetic radiation or light having a wavelength greater than 100 nm but less than 400 nm. It is also known as UV radiation, ultraviolet light, or simply UV. Ultraviolet radiation has a wavelength longer than that of x-rays but shorter than that of visible light.

Which UV rays are most harmful?

Short-wavelength UVC is the most damaging type of UV radiation. However, it is completely filtered by the atmosphere and does not reach the earth's surface. Medium-wavelength UVB is very biologically active but cannot penetrate beyond the superficial skin layers.

What is UV light good for?

The three primary health benefits of UV exposure are the production of vitamin D, improvement in mood, and increased energy. Moderate exposure to UV radiation is a good source of vitamin D. This vitamin aids in the regulation of calcium metabolism, insulin secretion, blood pressure, immunity, and cell propagation.

How does UV destroy DNA?

Direct DNA damage can occur when DNA directly absorbs a UVB photon, or for numerous other reasons. UVB light causes thymine base pairs next to each other in genetic sequences to bond together into pyrimidine dimers, a disruption in the strand, which reproductive enzymes cannot copy.

What are the 3 types of UV light what makes them different from each other?

UVA rays have the longest wavelengths, followed by UVB, and UVC rays which have the shortest wavelengths. While UVA and UVB rays are transmitted through the atmosphere, all UVC and some UVB rays are absorbed by the Earth's ozone layer.

Can humans see UV light?

According to almost any source about the light spectrum, visible light, the portion of the electromagnetic spectrum that is visible to the human eye, is the range of wavelengths between 400 to 700 nanometers. Ultraviolet light (UV), which ranges from 10 to 400 nanometers, is not detectable to the human eye.

How does UV radiation affect the environment?

Effects on the environment

Ultraviolet radiation not only affects humans, but wildlife as well. Excessive UV -B inhibits the growth processes of almost all green plants. There is concern that ozone depletion may lead to a loss of plant species and reduce global food supply.

Is ultraviolet radiation visible or invisible?

Ultraviolet (UV) light has shorter wavelengths than visible light. Although UV waves are invisible to the human eye, some insects, such as bumblebees, can see them.

Why is it called ultraviolet?

"Ultraviolet" means "beyond violet" (from Latin ultra, "beyond"), violet being the color of the highest frequencies of visible light. Ultraviolet has a higher frequency (thus a shorter wavelength) than violet light.

What is difference between UV and UV?

UV-A is Present in Daylight, UV-C is Not

While solar radiation includes all wavelengths of UV energy, only UV-A and some UV-B pass through the earth's atmosphere. UV-C, on the other hand, is absorbed by the earth's ozone layer, and does not reach the ground.

What are some examples of UV light?

How can we protect UV rays?