A radioacitve element has mass of 10 gm at an instant \( t=0 \). Calculate mass of the element \...

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A radioacitve element has mass of 10 gm at an instant \( t=0 \). Calculate mass of the element
\( \mathrm{P} \) after two mean lives. (Take : \( \mathrm{e}^{2}=7.4 \) )

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