Question: The Zel'dovich number is a dimensionless number named after a scientist that died in what year?
Sentence (from "Zel'dovich number"): The Zel'dovich number is a dimensionless number which provides a quantitative value for the activation energy of a chemical reaction which appears in the Arrhenius exponent, named after the Russian scientist Yakov Borisovich Zel'dovich.
Relevant evidence: Yes