Would you like to see inside of people's bones? Well, it certainly has become much easier with the help of X-rays! These waves are listed 6th on the Electromagnetic Spectrum as they contain a frequency of 30 PHz to 30 EHz, and wavelengths between 10 pm to 10 nm. Practical applications include dentists who use X-rays to take a photo of your teeth, airport security who use them to see through your bags. X-Rays are also emitted by hot gases in the atmosphere. For your safety, protect you body with a deflectant of some sort that will reduce the amount of radiation that your body consumes. Excessive x-ray use could also likely cause cancer.