1.

`._(92)U^(238)` emits `8 alpha-` particles and `6 beta-` particles. The `n//p` ratio in the product nucleus isA. `(62)/(41)`B. `(60)/(41)`C. `(61)/(42)`D. `(62)/(42)`

Answer» Correct Answer - A
`8 alpha-` particle emission decreases the atomic mass number by `8xx4=32`. Thereofre ,a atomic mass number of product nucleus is `238-32=206`.
`6 beta-` particles and `8 alpha-` particles emission decreases the atomic number of by `8xx2-6xx1=10`. Therefore, atomic number of product nucleus `=92-10=82`.
`:. ` number of neutrons in nucleus `=206-82=124`.
`:. (n)/(0)=(cancel(124)^(2))/(cancel(82)^(2))=(62)/(41)`


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