The half-life of 238 92U undergoing α -d...

The half-life of 238 92U undergoing α -decay is 4.5 × 109 years. What is the activity of 1g sample of 238 92U

`3.89xx10^(11)Bq`

`3.89xx10^(8)Bq`

`1.23xx10^(4)Bq`

`1.23xx10^(5)Bq`

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