Question

Masses of two isobars $20Cu^{64}$and $30Zn^{64}$ are 63.9298u and 63.9292u respectively. It can be concluded from these data that

• A. Both the isobars are stable
• B. $Zn^{64}$is radioactive decaying to $Cu^{64}$through $\beta - decay.$
• C. $Cu^{64}$is radioactive decaying to $Zn^{64}$ through $\gamma - decay$
• D. $Cu^{64}$is radioactive decaying to $Zn^{64}$ through $\beta - decay$

Answer 1

Answer: (D)

$Cu^{64}$is radioactive decaying to $Zn^{64}$ through $\beta - decay$

Answer 2

$\mathbf{C}\mathbf{u}^{\mathbf{64}}$ is radioactive after $\beta$ -decay its atomic number increases by one and its mass number doesn’t change.

$\therefore$ it decay to $Zn^{64}$