Question: What developer of the Bragg–Gray cavity theory was knighted in 1920?
Sentence (from "William Henry Bragg"): Sir William Henry Bragg (2 July 1862 – 12 March 1942) was a British physicist, chemist, mathematician and active sportsman who uniquely shared a Nobel Prize with his son William Lawrence Bragg – the 1915 Nobel Prize in Physics: ""for their services in the analysis of crystal structure by means of X-rays"".
Relevant evidence: No