Do you enjoy the feeling of the sun's rays shining down, warming your skin? If so, then you have got to buy yourself some Ultra-violet Rays. These kind of waves are fifth on the EM, and have a frequency of 800 THz to 30 PHz, and a wavelength of 10 nm to 380 nm. You may use Ultra-Violet Rays to tan(or burn) your skin, as they are emitted from the sun and "hot" objects in space. Some risks of these waves is prolonged use can certainly turn any type of skin into a nice bright red burn. Several long exposures can inevitably lead to skin cancer and sun spots.