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A sample of radioactive element has a ma...

A sample of 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

`3.70 g`

B

`6.30 g`

C

`1.35 g`

D

`2.50 g`

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The correct Answer is:
C
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