A Radioactive Source Has a Half-Life of 2 Min

question 24

Multiple Choice

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.The counting rate at t = 4 min will be

• A)1500 counts/s
• B)750 counts/s
• C)375 counts/s
• D)188 counts/s
• E)94 counts/s

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