Question

${}_{92}{U}^{238}$ emits $8\alpha -$ particles and $6\beta -$ particles. The neutron / proton ratio in the product nucleus is:

• A. $60:41$
• B. $61:40$
• C. $62:41$
• D. $61:42$

Answer 1

Answer: (C)

$62:41$

${}_{92}{\text{U}}^{238}\stackrel{8\alpha }{\to }{}_{76}{\text{X}}^{206}\stackrel{6\beta }{\to }{}_{82}{Y}^{206}$

Neutrons = $206-82=124$
Protons = $82$
Ratio = $124:82\Rightarrow 62:41$