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electromagnetic waves, just like visible light.
a very short wavelength and are able to pass through many mediums that are opaque to light.
"X-ray imaging creates pictures of the inside of your body. The images show the parts of your body in different shades of black and white. This is because different tissues absorb different amounts of radiation. Calcium in bones absorbs x-rays the most, so bones look white. Fat and other soft tissues absorb less, and look gray. Air absorbs the least, so lungs look black." (www.nlm.nih.gov)
"In 1895, a German physicist named Wilhelm Roentgen made the discovery while experimenting with electron beams in a gas discharge tube." (science.howstuffworks.com)
"Roentgen noticed that a fluorescent screen in his lab started to glow when the electron beam was turned on. This response in itself wasn't so surprising -- fluorescent material normally glows in reaction to electromagnetic radiation -- but Roentgen's tube was surrounded by heavy black cardboard. Roentgen assumed this would have blocked most of the radiation. "(science.howstuffworks.com)
"Roentgen placed various objects between the tube and the screen, and the screen still glowed. Finally, he put his hand in front of the tube, and saw the silhouette of his bones projected onto the fluorescent screen. Immediately after discovering X-rays themselves, he had discovered their most beneficial application."(science.howstuffworks.com)
"The first X-ray (or roentgenogram) was of Roentgen’s wife’s hand, complete with wedding ring, in 1895. His wife was less than impressed and declared: 'I have seen my death!'" (facts.randomhistory.com)
"...electrons strik[ing] a metal target. The electrons are liberated from the heated filament and accelerated by a high voltage towards the metal target. The X-rays are produced when the electrons collide with the atoms and nuclei of the metal target."
(www.nobelprize.org)
(www.explorecuriocity.org)