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A radioactive substance has a half life of 4 years. If its activity today is 200 dps, ...

A radioactive substance has a half life of 4 years. If its activity today is 200 dps, its activity in 8 years from today is ____________

A. \(50 \mathrm{dps}\)
B. \(25 \mathrm{dps}\)
C. \(20 \mathrm{dps}\)
D. \(10 \mathrm{dps}\)




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