Summary:
- Yvette Cauchois was a French physicist who made significant contributions to the understanding of X-ray spectra in the early 20th century.
- She discovered the existence of a "hidden element" in X-ray spectra, which led to the identification of new elements and the development of the field of X-ray spectroscopy.
- Cauchois's work helped establish the foundations of modern atomic and molecular physics, and her contributions were recognized with numerous awards and honors throughout her career.