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: [AIPMT 2001]

A)             \[a=c+12,\text{ }d=b5\]

B) \[a=c-8,\text{ }d=b-1\]

C) \[a=c-6,\text{ }d=b-0\]

D) \[~a=c-4,\text{ }a=b-2\]

Correct Answer: A

Solution :

[a]

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

or         \[a=c+12\,\,b=d+5\]

\[d=b-5\]