The historically confirmed order of discovery for the positron, muon, and pion,

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1. The historically confirmed order of discovery for the positron, muon, and pion, from earliest to latest, is?

Positron, then muon, then pion

Pion, then muon, then positron

Muon, then positron, then pion

All three were discovered in the same year

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The positron was discovered in 1932, the muon (once called the mu-meson) in 1936, and the pion (once called the pi-meson) in 1947.