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The "x" is not an abbreviation of another word. It's the "x" from algebra,

which refers to any unknown quantity. Wilhelm Roentgen did not know

what had passed through his hand and accidentally produced an image

of the bones in his hand on a nearby piece of film, and he referred to

whatever it was as "X strahlen" ... German for "X rays" where 'X' means

'unknown'. In Europe X-rays are known as Roentgen rays.

X-Radiation is a form of electromagnetic radiation having a wavelength of

0.01 to 10 nanometers.

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11y ago

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