Modern Physics 3 Question 19

19. Masses of two isobars 29Cu64and30Zn64 are 63.9298u and 63.9292u respectively. It can be concluded from these data that

(1997C, 1M)

(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

Show Answer

Solution:

  1. In beta decay, atomic number increases by 1 whereas the mass number remains the same.

Therefore, following equation can be possible

2964Cu3064Zn+1e0



NCERT Chapter Video Solution

Dual Pane