Question
In a radioactive decay chain reaction, 90 230 Th nucleus decays into Po 84 214 nucleus. The ratio of the number of α to number of β - particles emitted in this process is _______.
JEE Advanced
Physics
Nuclear Physics
2022
JEE Advanced 2022 (Paper 2)
JEE Advanced Physics Question (2022) — Solution
Options
- A. A
- B. B
- C. C
- D. D
Answer
A. A
Step-by-step solution
Let number of α particles are n α and β particles are n β . Given: 90 Th 230 → 84 Po 214 + n α α + n β β . Change in mass number is = 230 - 214 = 4 n α ⇒ n α = 4 Number of proton, n β = 84 - 90 - 2 n a ⇒ n β = 2 So, the ratio, n α n β = 2
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