What is ultra violet used for?

Answer 1

ultraviolet light, or UV light, is a type of electromagnetic radiation that has a wavelength somewhere between visible light and X-rays. It is widely used throughout the world, in everything from production of usable electricity (the sun's rays are ultraviolet) to the many common uses for a simple black light.

Sun Tanning

All sun tanning beds use ultraviolet lights in order to simulate the effects of sunlight against bare skin. Just like real sun bathing, people who use tanning beds run the risk of developing sunburn.

Hunting

Many hunters will use an ultraviolet light, such as a black light, to locate and follow a wounded animal. This is done by shining the light on the ground and following the illuminated blood trail.

Forensics

Forensic scientists will also use ultraviolet lights to look for clues at a crime scene.

CD/DVD Players

CD and DVD players use lasers, which are a form of ultraviolet light, to read information off of the disc.

Security

To fight counterfeiting, many government or otherwise sensitive documents will have some sort of ultraviolet verification. In other words, if you shined a black light over a $20 bill, you would see markings on an authentic bill that you wouldn't find on a fake.

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Answer 2

We know that the Sun is a source of ultraviolet (or UV) radiation, because it is the UV rays that cause our skin to burn! Stars and other "hot" objects in space emit UV radiation.