# NEET Physics Nuclei Questions Solved

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A radioactive nucleus undergoes a series of decay according to the scheme
$\mathrm{A}\stackrel{\mathrm{\alpha }}{\to }{\mathrm{A}}_{1}\stackrel{\mathrm{\beta }}{\to }{\mathrm{A}}_{2}\stackrel{\mathrm{\alpha }}{\to }{\mathrm{A}}_{3}\stackrel{\mathrm{\gamma }}{\to }{\mathrm{A}}_{4}$
If the mass number and atomic number of A are 180 and 72
respectively, then what are these number for ${\mathrm{A}}_{4}$

(a) 172 and 69        (b) 174 and 70
(c) 176 and 69        (d) 176 and 70

(a) ${}_{72}{}^{180}\mathrm{A}\stackrel{\mathrm{\alpha }}{\to }{}_{70}{}^{176}\mathrm{A}_{1}\stackrel{\mathrm{\beta }}{\to }{}_{71}{}^{176}\mathrm{A}_{2}\stackrel{\mathrm{\alpha }}{\to }{}_{69}{}^{172}\mathrm{A}_{3}\stackrel{\mathrm{\gamma }}{\to }{}_{69}{}^{172}\mathrm{A}_{4}$

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