Answer: Wilhelm Röntgen
Explanation:
The German physicist Wilhelm Röntgen was the one who discovered the X-rays in 1895, while conducting experiments to investigate the violet fluorescence produced by the cathode rays. After this, he used photographic plates to show that the objects were more or less transparent to X-rays depending on their thickness and performed the first human radiography, using his wife's hand.
He called these newly discovered rays "X-rays" because he did not know what they were and thanks to this discovery he was awarded the Nobel Prize in 1991.
At present it is known that X-rays are electromagnetic radiation, whose wavelength is between 10 nm and 0.01 nanometers, invisible to the human eye, capable of crossing opaque bodies and of being an ionizing radiation.
