A radioactive source has a half-life of 2 min.At time t = 0 it is placed near a detector and the counting rate is observed to be 3000 counts/s.If the detection efficiency is 25%,how many radioactive nuclei are there at time t = 2 min? A)1.04 $\times$ 10⁶ B)1.67 $\times$ 10⁶ C)2.08 $\times$ 10⁶ D)3.41 $\times$ 10⁶ E)3.79 $\times$ 10⁶

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The Answer of A radioactive source has a half-life of 2 min.At time t = 0 it is placed near a detector and the counting rate is observed to be 3000 counts/s.If the detection efficiency is 25%,how many radioactive nuclei are there at time t = 2 min? A)1.04 $\times$ 10⁶ B)1.67 $\times$ 10⁶ C)2.08 $\times$ 10⁶ D)3.41 $\times$ 10⁶ E)3.79 $\times$ 10⁶

A Radioactive Source Has a Half-Life of 2 Min ×\times× 106 B)1

A Radioactive Source Has a Half-Life of 2 Min $\times$ 10⁶
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