What is it? An X-ray is an invisible electromagnetic radiation, with wave lengths that are shorter than the light that is visible to the eye. When was it discovered? X-rays were discovered in 1895 by Wilhelm Conrad Roentgen, a German physicist. How did he discover X-rays? He discovered the X-ray while he was studying cathode rays in a high voltage, gaseous-discharge tube. He noticed when the tube was in operation it made a screen emit fluorescent …showed first 75 words of 251 total…

…showed last 75 words of 251 total…knifes and other harmful objects into the plane. Medical uses An X-ray picture is called a radiograph, Fluoroscopy are used extensively in medicine as diagnostic tools. X-rays are used to treat certain diseases in radiotherapy. Such as, cancer which in that process they expose the tumors to X radiation. Doctors could also see inside the body through the soft tissue. They could see things such as bones and dysfunctional parts of tissue in the body.