DefinitionEasy1 mark
Define nuclear fission.
Topic: Nuclear physics / radioactivity
Previous-year question practice database
Answer
Exam answer
Nuclear fission is the splitting of a heavy nucleus into two lighter nuclei, usually with emission of neutrons and release of large energy.
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An atom of lithium contains 3 electrons, 3 protons and 4 neutrons. Its mass number is:
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(b) 4
(c) 7
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