At the initial moment the activity of a certain radionuclide totaled 650 particles per minute. What will be the activity of the preparation after half of its half-life period ?
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Sol. The activity is proportional to the number to the number of parent nuclei(assuming that the daughter is not radioactive). In half its half-life period, the number of parent nucli decrease by a factor
So activity decreases to 
particles per minute.
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