Biography
Sir William Henry Bragg was born on July 2, 1862, in Wigton, Cumberland, and became a leading physicist of the early 20th century. He was educated at Old Grammar School and King William's College before going to Trinity College, Cambridge, where he studied mathematics and natural sciences. After graduating in 1884, Bragg took a job as Professor of Mathematics and Physics at the University of Adelaide in Australia, where he spent 23 years advancing his scientific work.
In Adelaide, Bragg started by focusing on electromagnetic theory and radioactivity research. He became interested in X-rays around 1904, following Wilhelm Röntgen's discoveries and the work on radioactive decay by Ernest Rutherford and others. Bragg investigated X-rays and gamma rays, developing ideas about their particle-like properties that initially challenged the popular wave theory but later helped in understanding wave-particle duality.
In 1909, Bragg returned to England to become the Cavendish Chair of Physics at the University of Leeds. There, he began his important work on X-ray crystallography with his son Lawrence, who was a student at Cambridge. Together, they developed methods to use X-rays to determine the atomic structure of crystals, leading to Bragg's Law, which explains the link between the angle of X-ray diffraction and the spacing between atomic planes in crystals.
Their father-son collaboration was highly successful, earning them the Nobel Prize in Physics in 1915. William Bragg later moved to University College London as Quain Professor of Physics in 1915, and in 1923, he became Director of the Royal Institution, a role he held until he retired. Throughout his later career, he continued his research in X-ray crystallography and became known for his talent in making science accessible to the public through lectures and popular writing. He married Gwendoline Todd, and their family became prominent in science, with Lawrence also gaining significant acclaim in physics. William Bragg died in London on March 12, 1942, leaving a greatly improved understanding of atomic structure and crystal analysis.
Before Fame
William Bragg grew up in Cumberland, and at first, there wasn’t much to suggest he'd become a renowned scientist. He studied at Trinity College, Cambridge, and then took a professorship at the University of Adelaide in 1886, mainly because there weren't many academic roles available in Britain. Australia turned out to be a great place for him to grow intellectually, allowing him the freedom to explore different areas of physics without the limitations of established research structures.
At that time, during the late Victorian era, there were major discoveries happening in physics, especially concerning electromagnetic radiation and atomic structure. Bragg moved from pure mathematics to experimental physics around the time of key breakthroughs, like Röntgen discovering X-rays in 1895 and Becquerel and the Curies identifying radioactivity. These advances opened up new possibilities for researchers interested in unexplored areas of science, and Bragg's careful approach and strong math skills made him well-suited to contribute to these new fields.
Key Achievements
- Co-winner of the 1915 Nobel Prize in Physics with son Lawrence for X-ray crystal structure analysis
- Formulated Bragg's Law, the fundamental equation governing X-ray diffraction in crystals
- Pioneered the field of X-ray crystallography, enabling determination of atomic arrangements in solids
- Served as Director of the Royal Institution from 1923-1940, advancing public understanding of science
- Received the Copley Medal in 1930, the Royal Society's highest honor for scientific achievement
Did You Know?
- 01.William and Lawrence Bragg remain the only father-son duo to share a Nobel Prize in any category
- 02.At age 53 when he won the Nobel Prize, William was notably older than most physics laureates, while his son Lawrence was only 25, making him the youngest Nobel laureate in physics at the time
- 03.Bragg initially proposed that X-rays were particles rather than waves, putting him in opposition to most physicists of his era, though this work later contributed to understanding wave-particle duality
- 04.He spent 23 years in Australia at the University of Adelaide, where he initially had no laboratory and had to build his experimental apparatus from scratch
- 05.Bragg was known for his Friday Evening Discourse lectures at the Royal Institution, where he made complex scientific concepts accessible to general audiences using creative demonstrations and analogies
Family & Personal Life
Awards & Honors
| Award | Year | Details |
|---|---|---|
| Nobel Prize in Physics | 1915 | for their services in the analysis of crystal structure by means of X-rays |
| Fellow of the Royal Society | — | — |
| Knight Commander of the Order of the British Empire | — | — |
| Copley Medal | 1930 | — |
| Faraday Medal | 1936 | — |
| Rumford Medal | 1916 | — |
| Matteucci Medal | 1915 | — |
| John J. Carty Award for the Advancement of Science | 1939 | — |
| Franklin Medal | 1930 | — |
| Royal Society Bakerian Medal | 1915 | — |
| Honorary Fellow of the Royal Society Te Apārangi | 1923 | — |