Modern Physics 7 Question 43
47. Match List-I of the nuclear process with List-II containing parent nucleus and one of the end products of each process and then select the correct answer using the codes given below the lists.
(2013 Adv.)
| List I | List II | |
|---|---|---|
| P. | Alpha decay | 1. ${ } _8^{15} O \rightarrow{ } _7^{17} N+\ldots$ |
| $\beta^{+}$decay | 2. $\quad{ } _{92}^{238} U \rightarrow{ } _{90}^{234} Th+\ldots$ | |
| $R$. | Fission | 3. ${ } _{83}^{185} Bi \rightarrow{ } _{82}^{184} Pb+\ldots$ |
| S. | Proton emission | 4. ${ } _{94}^{239} Pu \rightarrow{ } _{57}^{140} La+$. |
Codes
| $P$ | $Q$ | $R$ | $S$ | |
|---|---|---|---|---|
| (a) | 4 | 2 | 1 | 3 |
| (b) | 1 | 3 | 2 | 4 |
| (c) | 2 | 1 | 4 | 3 |
| (d) | 4 | 3 | 2 | 1 |
Show Answer
Answer:
Correct Answer: 47. (c)
Solution:
- (p) In $\alpha$-decay mass number decreases by 4 and atomic number decreases by 2 .
(q) $\ln \beta^{+}$-decay mass number remains unchanged while atomic number decreases by 1 .
(r) In fission, parent nucleus breaks into all most two equal fragments.
(s) In proton emission both mass number and atomic number decreases by 1 .
