[" A radioactive isotope has initial act...

[" A radioactive isotope has initial activity of "28dpm" .Its activity is reduced to "14dpm" after half an "],[" hour.The initial number of nuclide in sample was: "],[[" (1) "200," (2) "400," (3) "600," (4) "1200]]

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[" A radioactive isotope has initial activity of "28dpm" .Its activity is reduced to "14dpm" after half an "],[" hour.The initial number of nuclide in sample was: "],[[" (1) "200," (2) "400," (3) "600," (4) "1200]]

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