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[" Q."8" The activity of the radioactive...

[" Q."8" The activity of the radioactive sample drops to "1/64" of its original value in "2" hr.Find the decay "],[" constant "(lambda)" ."],[" Q.9A radioactive substance decays "20%" in "10" min.If at start there are "5times10^(20)" atoms present,find time "]

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