A sample of a radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the sample after two mean lives is .

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A sample of a radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the sample after two mean lives is .
05
Jun
A sample of a radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the sample after two mean lives is . A sample of a radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the [...]
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