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Prolonged exposure to UV rays can indeed harm people in the form of DNA damage, eye damage, skin cancer, and, of course, sunburn.

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1. Bug Zappers

2. "Black Lights" in places like Laser Quest

3. Sterilization of food and drugs

4. Getting Sun tans

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Ultraviolet of UV rays have one of the shorter wavelengths on the electromagnetic spectrum.

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1. UV Rays Come from the Sun

2. There are three types of UV rays.  UV-A, UV-B, and UV-C

3. UV-A has a wavelength of 400-315 nm

4. UV-B has a wavelength of 315-280 nm

5. UV-C has a wavelength of 280-100 nm

6. Prolonged exposure to UV rays can indirectly cause DNA damage and, of course, cause sunburn

7. UV rays have an approximate frequency of 8 × 10¹⁴ to 3 × 10¹⁶ cycles per second