Question

Carbon $(Z=6)$ with mass number 11 decays to boron $(Z=5)$. (a) Is it a $\beta^{+}$-decay or a $\beta^{-}$-decay? (b) The half-life of the decay scheme is 20.3 minutes. How much time will elapse before a mixture of $90 \%$ carbon-11 and $10 \%$ boron-11 (by the number of atoms) converts itself into a mixture of $10 \%$ carbon-11 and $90 \%$ boron- 11?

Accepted Answer

(a) $\beta^{+};$ (b) $64 \mathrm{~min}$

Answer

(a) $\beta^{+};$ (b) $46 \mathrm{~min}$

Answer

(a) $\beta^{+};$ (b) $58 \mathrm{~min}$

Answer

(a) $\beta^{+};$ (b) $44 \mathrm{~min}$

JEE PHYSICS MCQ: NUCLEI

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