A) one proton and one neutron
B) one \[\alpha \]-particle and one \[\text{-}\]particle
C) two \[\text{-}\]particle and one neutron
D) two \[\text{-}\]particle and one proton
Correct Answer: B
Solution :
We know that when a-particle is emitted then atomic mass number is reduced by 4 unit and atomic number is reduced by 2 unit and when \[\beta \]-particle is emitted from a nucleus then mass number remain unchanged and atomic number is increased by 1 unit. Therefore, when radioactive decay of \[{}_{92}{{U}^{238}}\] is changed to \[{}_{91}{{U}^{234}},\] then it is quite clear that one \[\alpha \]-particle and one \[\beta \]-particle is emitted.
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