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form of electromagnetic radiation This article is about the nature, production, and uses of the radiation. For the method of imaging, see Radiography. For imaging in a medical context, see Radiology. For other meanings, see X-ray (disambiguation). Not to be confused with X-wave or X-band. X-rays are part of the electromagnetic spectrum, with wavelengths shorter than visible light. Different applications use different parts of the X-ray spectrum. X-ray of human lungs X-rays make up X-radiation , a form of electromagnetic radiation. Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, 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 100 eV to 100 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to with terms meaning Röntgen radiation , after the German scientist Wilhelm Röntgen who discove