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[" The count rate of "109" of radioactiv...

[" The count rate of "109" of radioactive material was measured at different times "],[" and this has been shown in fig.The half life of material and the total counts."],[" approximately) in the first half life period,respectively are- "],[[" 1) "4h,9000," (2) "3h,14000],[" 3) "3h,235," (4) "3h*50]]

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