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[" A radioactive sample undergoes decay ...

[" A radioactive sample undergoes decay as "],[" per the following graph.At time "t=0," the "],[" number of undecayed nuclei is No.Calculate "],[" the number of nuclei left after "1h:],[qquad [N_(0)],[N_(0)/4]],[qquad [N_(0)/4,=-(1)/(1)+(1)/(1)+t(min)]]

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