X-rays (in English: X ray) is electromagnetic radiation with a wavelength between 10 and 0.01 nm, ie, that the energy rays between 120 and 120 thousand electron volts. Used in many medical fields are given clear images of bones where they appear white, air shows and black tissue.
Discovered by German scientist William Roentgen in 1896 at the University of Wuerzburg, and won them the Nobel Prize in Physics in 1901.
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