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Masses of two isobars \( { }_{29} \mathrm{Cu}^{64} \) and \( _{30} \mathrm{Zn}^{64} \) are \( 63.9298 \mathrm{u} \) and \( 63.9292 \) u respectively. It can be concluded from these data
\( \mathrm{P} \) that \( \quad(1997 \mathrm{C}, 1 \mathrm{M}) \)

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(a) both the isobars are stable
(b) \( \mathrm{Zn}^{64} \) is radioactive, decaying to \( \mathrm{Cu}^{64} \) through \( \beta \)-decay
(c) \( \mathrm{Cu}^{64} \) is radioactive, decaying to \( \mathrm{Zn}^{64} \) through \( \gamma \)-decay
(d) \( \mathrm{Cu}^{64} \) is radioactive, decaying to \( \mathrm{Zn}^{64} \) through \( \beta \)-decay
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