Question: When did Francis Perrin's father die?
Sentence (from "Jean Baptiste Perrin"): Jean Baptiste Perrin (30 September 1870 – 17 April 1942) was a French physicist who, in his studies of the Brownian motion of minute particles suspended in liquids, verified Albert Einstein’s explanation of this phenomenon and thereby confirmed the atomic nature of matter (sedimentation equilibrium).
Relevant evidence: Yes