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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` ?

A

`7 alpha, 5beta`

B

`6 alpha, 4beta`

C

`4 alpha, 3beta`

D

`8alpha, 6 beta`

Text Solution

Verified by Experts

The correct Answer is:
D
`""_(92)U^(238) to ""_(82)Pb^(206)+m_(2)He^(4)+m-1^(e^(0))`
On comparing both sides
`=238=206 +4m`
`rArr m=8`
`92=82+2m-n`
`2m-n=10`
`rArr n=6`
`:.alpha` particle emitted ,m=8
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