Nuclei - Result Question 85
87. After $1 \alpha$ and $2 \beta$-emissions
[1999]
(a) mass number reduces by 4
(b) mass number reduces by 5
(c) mass number reduces by 6
(d) mass number increases by 4
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Answer:
Correct Answer: 87. (a)
Solution:
- (a) Emission of $1 \alpha$ particle led to decrease in atomic number by 2 while mass number by 4 . On the other hand, emission of $2 \beta$ particles increases atomic number by 2 . Hence, overall emission of, $1 \alpha$ and $2 \beta$ particles led to decrease in mass number by 4 .
