- It is produced by sun, special lamps and very hot bodies.
- Its frequency lies between 8 x 10^14 Hz to 5 x 10^16 Hz.
- Its wavelength lies between 400 nm to 0.6 nm .
- Most of the ultraviolet radiations coming from the sun are absorbed by the ozone layer in the earth's atmosphere.
- The UV rays in large quantity produce harmful effect on human being, it causes production of melanin, training of the skin.
- It is absorbed by the ordinary glass.
Uses:
- Due to its short wavelength it can be focused into very narrow beam which is used for high precision applications e.g., LASIK (laser assisted in situ keratomileusis) eye surgery.
- UV lamps are used to kill germs in water purifiers.
- To destroy the bacteria and for sterilizing the surgical instruments.
