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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2003
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Q)

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


( A ) 6.30 gm
( B ) 3.70 gm
( C ) 1.35 gm
( D ) 2.50 gm

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