The correct answer is Only 1 and 2. Key Points Wilhelm Conrad Rontgen He was the recipient of the first Nobel Prize for Physics in 1901. His discovery of X rays revolutionised the fields of physics and medicine. He discovered X rays radiation. Hence the correct answer is 1 and 2 Only. Additional Information Wilhelm Rontgen: Awarded the first Nobel Prize in Physics, Wilhelm Rontgen discovered X-radiation. This X-ray tube became a frequently used instrument in medicine after this discovery. In honour of Rontgen's accomplishments, in 2004 the International Union of Pure and Applied Chemistry (IUPAC) named element 111, roentgenium, a radioactive element with multiple unstable isotopes, after him. The unit of measurement roentgen was also named after him.