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Critical Mass: when the atomic bomb got real

Physics of critical mass for uranium, mostly the work of Rudolf Peierls on nuclear fission and how a simple question from Otto Frisch led to the realization that an atomic bomb was possible. Follow-up video: How to calculate an atomic bomb's critical mass    • How to calculate an atomic bomb's cri...   Playlist Physics of Nuclear Weapons:    • Physics of Nuclear Weapons   "Critical Assembly Simulator" by Alex Wellerstein https://blog.nuclearsecrecy.com/misc/... Erratum: at 3:00 the number of protons and neutrons is incorrect, it should say "U-235: 92 protons + 143 neutrons; U-238: 92 protons + 146 neutrons" 00:00 Introduction 01:01 Nuclear Fission 02:20 Critical mass: Bohr 03:25 Critical mass: Perrin 04:27 Critical mass: Peierls 08:29 Cross section & mean free path 09:59 Critical mass: Frisch-Peierls