Sir William Henry Bragg (2 July 1862 – 10 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.
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- On Mondays, Wednesdays, and Fridays we use the wave theory; on Tuesdays, Thursdays, and Saturdays we think in streams of flying energy quanta or corpuscles.
- in Electrons & Ether Waves : being the twenty-third Robert Boyle lecture, on 11th May 1921, Oxford University Press, 1921, p. 11.