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A radioactive nucleus has specific binding energy $\mathrm{E}_{1}$. It emits an $\alpha$-particle. The resulting nucleus has specific binding energy $\mathrm{E}_{2}$. Then
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The correct answer is:
$\mathrm{E}_{2}>\mathrm{E}_{1}$
The nucleus become more stable on emission of $\alpha$-particle, hence $\mathrm{E}_{2}>\mathrm{E}_{1}$.
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