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A Radioactive Material Initially Is Observed to Have an Activity

Question 1

Multiple Choice

A radioactive material initially is observed to have an activity of 1000 decays/sec.If nine hours later it is observed to have an activity of 125 decays/s,what is its half-life?


A) 1/2 hour
B) 8 hours
C) 3 hours
D) 1 hour

Correct Answer:

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