ULTRAVIOLET RAYS By: Brenton edwards

Physical Description Invisible to the human eye Shorter wavelength than visible light 10 to 400 nanometers 800,000,000,000,000 to 30,000,000,000,000,000 cycles per second 186,000 miles per hour Electromagnetic radiation

Uses Drying clothes Sunbed research Zapping bugs Tans

Source Sunlight UV lamps Arc welding Mercury vapour lamps

Benefits and Hazards Benefits Vitamin d production Improved mood Acceleration of aging skin Promotion of skin cancer Etc.

Occupational Exposure Limits 315-400 nm

Applications Used to kill microbes UV lamps to sterilize food and drug companies product Used by a doctor to treat vitamin d deficiency

Fun Facts Ultraviolet rays are visible to bees Ultraviolet means beyond light Spanish beach umbrellas don’t provide sufficient sun protection You can still get sunburned on a sunny winter day