Discussion
When the nucleus of uranium is bombarded with neutrons, it breaks up into two nuclei of nearly equal mass. This process is called
Answer: A
This is nuclear fission.
\[\mathrm{^{235}_{92}U + ^1_0n \rightarrow ^{141}_{56}Ba + ^{92}_{36}Kr + 3\,^1_0n + energy}\] The two fragments are of comparable mass, and the extra neutrons released can trigger further fissions, giving a chain reaction. Hahn and Strassmann discovered it in 1938.
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