A 280 day old radioactive substances sho...

A 280 day old radioactive substances 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

12000 dps

D

6000 dps

Text Solution

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The correct Answer is:

B

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