A 280 day old radioactive substance shows an activity of 
day later its activity becomes 3000 dps. What was its initial activity?
Text Solution
Verified by ExpertsThe correct answer is:
B
Activity decreases from 6000 dps to 3000 dps in 140 days. It indicates that the half life 
days.
In 280 days (or two half lives), the activity reduces to 
th of the initial activity.
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