[" The half-life of a sample of a radioa...

[" The half-life of a sample of a radioactive substance is "],[1" hour.If "8times10^(10)" atoms are present at "t=0" ,then the "],[" number of atoms decayed in the duration "t=2" hour to "],[t=4" hour will be "],[[" (a) "2times10^(10)," (b) "1.5times10^(10)],[" (c) Zero "," (d) Infinity "]]

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[" The half-life of a sample of a radioactive substance is "],[1" hour.If "8times10^(10)" atoms are present at "t=0" ,then the "],[" number of atoms decayed in the duration "t=2" hour to "],[t=4" hour will be "],[[" (a) "2times10^(10)," (b) "1.5times10^(10)],[" (c) Zero "," (d) Infinity "]]

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