question_answer

                                          If \[_{b}^{a}X\] species emit firstly a positron, then two \[\alpha \] and two \[\beta \] and in last one a is also emitted and finally convert in \[_{d}^{c}Y\] species so correct relation is:                                                                                             

A)                 a = c + 12, d = b ? 5

B)                 a = c - 8, d = b ? 1

C)                 a = c - 6, d = b ? 0

D)                 a = c - 4, a = b ? 2

Correct Answer: A

Solution :

                                Hence, \[d=b-5,\,c=a-12\]                 or \[a=c+12\,\,b=d+5\]                 \[d=b-5\]