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A 280 days old radioactive substance shows an activity of 6000 dps 140 days later...

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A 280 days old radioactive substance shows an activity of 6000 dps 140 days later it s activity becomes 3000dps What was its initial activity A 20000 dps C 12000 dps B 24000 dps D 6000 dps 2004 100

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