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| weak in·ter·ac·tion or weak force |
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| Definition: |
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fundamental interaction involved with radioactive decay: the fundamental interaction between elementary particles that is mediated by the W and Z particles. It is involved in radioactive decay, which occurs by electron production, and particle decay. One of the four fundamental interactions, it is only effective at distances of less than 10-15 m and is a trillion times weaker than the strong interaction.
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