<P> X-radiation ( composed of X-rays ) is 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 Hz to 3 × 10 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 usually is credited as its discoverer , and who had named it X-radiation to signify an unknown type of radiation . Spelling of X-ray ( s ) in the English language includes the variants x-ray ( s ) , xray ( s ) , and X ray ( s ) . </P>
<P> X-radiation ( composed of X-rays ) is 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 Hz to 3 × 10 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 usually is credited as its discoverer , and who had named it X-radiation to signify an unknown type of radiation . Spelling of X-ray ( s ) in the English language includes the variants x-ray ( s ) , xray ( s ) , and X ray ( s ) . </P>
what does the x mean in x ray
what does the x mean in x ray
unknown type of radiation
unknown type of radiation