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The half life period of a first order radioactive decay of an element is 5 days. The time ( in days ) taken for 8 g of this element to decay to 1 g is

$\begin {array} {1 1} (1)\;15 & \quad (2)\;25 \\ (3)\;40 & \quad (4)\;10 \end {array}$

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(1) 15
answered Nov 7, 2013 by pady_1

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