Frequency: Ultraviolet Rays have a frequency of 789 THz.
Wavelength: Their wavelength ranges from 10 to 400 nanometers.
Practical Applications: Ultraviolet rays are found in the sun and used while getting a sun tan, to harden certain types of dental filling, and is used by food and drug companies to sterilize their products.
Negative Factors/ Health Precautions: If one is overexposed to ultraviolet rays they can receive eye damage, skin cancer, and or suppression of the immune system.
Future possibilities/interesting facts: Ultraviolet light is colloquially called black light, as it is invisible to the human eye. Ultraviolet traps are used to eliminate various small flying insects.
Location on the spectrum: Ultraviolet rays are 5th on the spectrum and have the fifth longest wavelength.