Non-visible light with a higher energy and shorter wavelength than violet light, UV is notable for its ability to cause DNA damage.

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Will an 11W UVC lamp kill bacteria?

If I shone a UVC lamp (11W) on something (say for example a plastic phone case) for an hour, would that kill off a noticeable amount of bacteria? That is, if I were to go over the case with a cotton ...
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Does every wave length of UV kill bacteria?

Will every wave length of UV work for killing bacteria? So will UV A, UV B and UV C all work? Or will only the shortest of the three, UV C, work? Also, will the average UV lamp help against bacterial ...
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How much time is required between repeated exposures to sun to prevent sunburn [closed]

After being in the sun, how much 'rest' is required before you can expose yourself again? e.g. from Wikipedia: Sunburn can occur in less than 15 minutes So if you were in a place where sunburn ...
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Detecting UV by humans

From my experience humans can detect UV - not by seeing it but by pain in their eyes. Many people (me too) feel pain when looking at UV lamps. When looking at sun through clouds I still can feel pain ...
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Are there specific conditions that allow humans to see ultraviolet wavelengths

It is fairly common knowledge that the lens in its normal state absorbs ultraviolet (UV) radiation. An interesting notion has come up from time to time in my reading that suggests there are a small ...
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What are the effects of excessive UV exposure on the human immune system?

In my readings, several authors have suggested that excessive/prolonged exposure to UV (particularly UVA) can have harmful long term effects on the human immune system. This leads to my question, ...