Physics, 18.11.2019 19:31 AngelyAce

4. there are two categories of ultraviolet light. ultraviolet a (uva) has a wavelength ranging from 320 nm to 400 nm. it is not harmful to the skin and is necessary for the production of vitamin d. uvb, with a wavelength of 280 nm and 320 nm, is much more dangerous because it causes skin cancer. what are the frequency ranges for uva and uvb light?

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