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Select the correct statement(s) :

A

SI unit of radioactivity is becquerel (Bq)

B

`1 Ci =3.7 xx10^(7)` Bq

C

`._(3)^(7)Li +_(1)^(1)H rarr _(2)^(4)He "is" (P, alpha)` type reaction

D

The half -time of a particular radioactive isotope is a characteristics constant of that isotope

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A, C, D
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