Question #76810
A 280 day old radioactive substance shows an activity of 6000 dps , 140 days later its activity becomes 3000 dps . What was its initial activity ? (A) 20000 dps (B ) 24000 dps (C) 12000dps (D) 6000 dps
1
Expert's answer
2018-05-03T09:08:08-0400
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