Masses of two isobars 29Cu64 and 30Zn64 are 63.9298 u and 63.9292 u respectively. It can be concluded from these data that

Q: Masses of two isobars ₂₉Cu⁶⁴ and ₃₀Zn⁶⁴ are 63.9298 u and 63.9292 u respectively. It can be concluded from these data that

(A) both the isobars are stable

(B) Zn⁶⁴ is radioactive, decaying to Cu⁶⁴ through β-decay

(C) Cu⁶⁴ is radioactive, decaying to Zn⁶⁴ through γ-decay

(D) Cu⁶⁴ is radioactive, decaying to Zn⁶⁴ through β-decay.

Ans: (D)