How many alpha and beta particles are em...

How many alpha and beta particles are emitted when uranium `._(92)^(238)U` decays to lead `._(82)^(206)Pb` ?

6 and B

8 and 6

12 and 6

8 and 12

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The correct Answer is:

(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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