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The half life of ""(38) Sr^(90) isotope ...

The half life of `""_(38) Sr^(90)` isotope is 28 years. What is the rate of disintegration of 15 mg of this isotope? (Given Avogadro No `=6.023 xx 10^(23) )`

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`7.877 xx 10^10` Bq or `2.13 Ci`
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