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How many alpha and beta^(-) decays does ...

How many alpha and `beta^(-)` decays does `U^(238)` experiences before turning finally into stable `Pb^(206)` isotope ?

A

6 and B

B

8 and 6

C

12 and 6

D

8 and 12

Text Solution

Verified by Experts

The correct Answer is:
B
(B) the number of `alpha ` - particles , `n_(1)`
`=("change in mass number ")/( 4) =(238-206)/(4)implies n_(1) =(32)/(4)=8`
Now , number of `beta `-particles ,`n_(2) =82-(92-2n_(1))`
`=82-(92-2xx8)=82-76=6`
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