1.

The number of `alpha and beta-`particles emitted in the nuclear reaction `._(90)Th^(228) rarr ._(83)Bi^(212)` are respectivelyA. 4 , 1B. 3 , 7C. 8, 1D. 4, 7

Answer» Correct Answer - A
`._(90)Th^(228)rarr ._(83)Bi^(212)`
No. of `alpha-"particle" = (228 - 212)/(4) = (16)//(4) = 4`
No. of `beta-"particle" = 2xx 4 - 90 + 83`


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