0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
What are 3 types of ultra violet radiation?
UVC UVB UVA
How do polarizing sunglasses work?
Sunglasses work by placing pieces of tinted plastic polymer in front of your eyes. Light at all frequencies (from Infrared, visual, and Ultraviolet) coming from the sun hits the lenses and they act as a filter absorbing certain frequencies in certain amounts and allowing others to pass through. "gray" sunglasses are neutral and thus absorb all frequencies of visual light in equal amounts where as "rose tinted" glasses absorb more of the frequenceies that make up green, blue, indigo, and violet, and allow mostly red, orange and yellow to pass through. This can distort your perception of color outside the glasses so I don't recommend any colored glasses be it pink, brown, green are anything else. It's a misconception that only polarized lenses can block Ultraviolet light however it is true that usually cheap glasses do not. Even if they say "block 100% of UV rays" you may want to ask if it blocks 100% of UVA, UVB, and UVC rays because most cheap glasses only block UVC rays which are harmless. Polarized lenses are made of special polarized plastic which can block polarized light reflections (or glare) from sources such as water or the atmosphere itself.
Which is the most harmful UVB or UVC?
UV-B and UV-C are filtered by the ozone layer present in the atmosphere and only UV-A reaches to the earth which cause the various skin infection. if we talk about the frequency of the UV-B and UV-C the because of the higher frequency the UV-C is more harmful. UV with the wavelength of 253.7 nm is used for its germicidal activity.
Why would you use a plastic prism?
I take it you mean "instead of glass / crystal" as opposed to why use a prism at all. 1. Cheaper - Depending on the material and specification, a simple prism can be made on an extrusion basis and simply sliced to length making for a very inexpensive product. 2. Lighter - many plastics are much less dense than glass - if the task can be handled with plastic and weight is an issue, glass would be a poor alternative. 3. Stability - although glass may have a higher survival rate (temperature), a prism that must be exposed for some reason may well be more vulnerable to chipping than plastic 4. Transmission / Reflection properties. Although most of the visible spectrum will pass well through all clear glass / plastics, as you begin to approach IR and most especially UV, the material have VERY different properties. UVB and UVC for example being blocked by most glass - hence UVC lamps use quartz rather than regular glass. To give more information, it would help to know if there is a specific focus to your question - eg: application specific - in which case other factors may or may not be worth mentioning.
Why doesn't uvc reach us?
UVC is entirely absorbed by dead skin cells and is not dangerous. UVC may be a problem on broken skin and if shone direct into the eyes for long periods but as a general killer of virus and bacteria it is very useful. There are no known links between UVC and cancers and by killing virus's it may prevent you getting virus induced cancers.
Which part of the em spectrum can be used to kill bacteria?
Ultraviolet (UV) radiation, specifically UVC light, can be used to kill bacteria. UVC light has a short wavelength and high energy, which damages the DNA and RNA of bacteria, preventing their growth and reproduction. This property makes UVC light an effective tool for disinfection purposes.
How long does it take uvc light to kill germs?
I have a uv filter on my pond pump and it kills bacteria in about a second. . . I have a uv-c light wand and in the directions it says that exposure times should be 10 to 20 seconds it might vary on what you are killing also. I know dust mites takes 20 seconds
Why does UVC not affect the skin?
UVC radiation is almost completely absorbed by the ozone layer and does not affect the skin as it doesnt get to us.
Does UV light kill germs?
Germicidal ultraviolet (UVC) 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. UV light at this wavelength (shortwave UV or UVC) causes adjacent thymine molecules on DNA to dimerize. The resulting thymine dimer is very stable. If enough of these defects accumulate on a microorganism's DNA its replication is inhibited, thereby rendering it harmless. The longer the exposure to UVC light, the more thymine dimers are formed in the DNA. If cellular processes are disrupted because of DNA damage, the cell cannot carry out its normal functions. If the damage is extensive and widespread, the cell will die.
What does production plan mean?
prod planning uvc
What is the definition of the word UVC?
There are two definitions for UVC. One being radiation in the ultraviolet spectrum and is more hazardous than UVB. The second is medical which has essentially the same meaning.
What are 3 types of ultra violet radiation?
UVC UVB UVA
What are some examples of ultraviolet light?
Radiation is a broad term since there are a lot of different types of "radiation." Example of Radiation include (but not limited to): Radiowaves, Microwaves, Infared, Visible light spectrum, Ultra Violet, X-Ray, Gammy Ray, and Cosmic Rays. Examples of UV light are UVA, UVB, and UVC. UVC doesn't penetrate the earth, but UVA and UVB do. UVA is responsible for sunburns and skin cancer after prolonged exposure, while UVB is tans for skin. A more popular UV example would be black lights.
Why can't you get a sunburn if you're behind glass?
This is not entirely true Even behind glass it is still possible to get sunburned but it takes a lot longer. The reason this is is because sunburn is not only from the brightness of the sun but the UV rays sent from the sun are basically slowly cooking our skin. That's why over exposure to the sun can lead to skin cancer. When behind glass the UV rays are not getting to you, so then its just the brightness of the sun that gives you a sunburn, however when it is just the light burning you it takes much longer to actually burn.
How is it possible for stratospheric ozone to offer any protection from UV radiation?
Ultraviolet radiation is a portion of the electromagnetic spectrum with wavelengths shorter than visible light. The sun produces UV, which is commonly split into three bands: UVA, UVB, and UVC. UVA is not absorbed by ozone. UVB is mostly absorbed by ozone, although some reaches the Earth. UVC is completely absorbed by ozone and normal oxygen. see related link
Can webcam work without CD?
If your webcam is UVC - USB Video Class compliant - and If you're running Windows Vista or Mac OSX 10.4 Tiger or 10.5 Leopard - the drivers for UVC webcams are built right into the operating system. No disc or drivers are needed.
