Modern Physics 5 Question 17
18. The correct statement is
(a) The nucleus ${ } _3^{6} Li$ can emit an alpha particle.
(b) The nucleus ${ } _{84}^{210}$ Po can emit a proton.
(c) Deuteron and alpha particle can undergo complete fusion.
(d) The nuclei ${ } _{30}^{70} Zn$ and ${ } _{34}^{82} Se$ can undergo complete fusion.
Show Answer
Answer:
Correct Answer: 18. (b)
Solution:
- (a) ${ } _3 Li^{7} \rightarrow{ } _2 He^{4}+{ } _1 H^{3}$
$$ \begin{aligned} \Delta m & =\left[M _{Li}-M _{He}-M _{H^{3}}\right] \\ & =[6.01513-4.002603-3.016050] \\ & =-1.003523 u \end{aligned} $$
$\Delta m$ is negative so reaction is not possible.
(b) ${ } _{84} Po^{210} \rightarrow{ } _{83} Bi^{209}+{ } _1 P^{1}$
$\Delta m$ is negative so reaction is not possible.
(c) ${ } _1 H^{2} \rightarrow{ } _2 He^{4}+{ } _3 Li^{6}$
$\Delta m$ is positive so reaction is possible.
(d) ${ } _{30} Zn^{70}+{ } _{34} Se^{82} \rightarrow{ } _{64} Gd^{152}$
$\Delta m$ is positive so reaction is not possible.
