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Which of the following radioactive decay...

Which of the following radioactive decay emits `alpha`-particle ?

A

`_82Pb^214 rightarrow _93Bi^214+.......`

B

`_92U^238 rightarrow _90Th^234+.......`

C

`_90Th^234 rightarrow _91Pa^234+.......`

D

`_91Pa^234 rightarrow _92U^234+.......`.

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