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PhysicsNEET 2021Radioactivity and decay law

Nuclei

A radioactive nucleus ZAX^{A}_{Z}\mathrm{X} undergoes spontaneous decay in the sequence

ZAX→Z−1B→Z−3C→Z−2D,^{A}_{Z}\mathrm{X} \rightarrow {}_{Z-1}\mathrm{B} \rightarrow {}_{Z-3}\mathrm{C} \rightarrow {}_{Z-2}\mathrm{D},

where ZZ is the atomic number of element X. The possible decay particles in the sequence are:

  1. A.α,β−,β+\alpha, \beta^-, \beta^+
  2. B.α,β+,β−\alpha, \beta^+, \beta^-
  3. C.β+,α,β−\beta^+, \alpha, \beta^-✓
  4. D.β−,α,β+\beta^-, \alpha, \beta^+

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