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 1600 decays/sec.If six hours later it is observed to have an activity of 400 decays/sec,what is its half-life?

• A) six hours
• B) three hours
• C) twelve hours
• D) eight hours
• E) ​not enough information

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