Wilhelm Conrad Röntgen (1845–1923). Discoverer of x-rays. He was awarded the first Nobel Prize in 1901.
Max von Laue (1879–1960). He demonstrated that x-rays were electromagnetic radiation with wavelengths comparable to the distance between atoms in crystals.
Sir William Henry Bragg (1862–1942) and Sir William Lawrence Bragg (1890–1971). Father and son. Showed how x-ray diffraction from crystals can be used to determine the structure of crystals.
