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Ultraviolet Rays

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.