Question
Question: A 280 day old radioactive substance shows an activity of 6000 dps 140 days later its activity become...
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
12000 dps
D
6000 dps
Answer
24000 dps
Explanation
Solution
: 24000 dps