An x ray or x radiation is a penetrating form of high energy electromagnetic radiation most x rays have a wavelength ranging from 10 picometres to 10 nanometres corresponding to frequencies in the range 30 petahertz to 30 exahertz 3 10 16 hz to 3 10 19 hz and energies in the range 124 ev to 124 kev x ray wavelengths are shorter than those of uv rays and typically longer than those of. það eru 31 5 mg af koffín í hverjum 100 ml og 6 vítamín. Extra energy choose the x express yourself explore your potential show the x expand your world go the extra mile be exeptional xeptional.