In a radioactive material the activity at time t 1 is R 1 and at a later time t 2 , it is R 2 . If the decay constant of the material is , then

1. A. R 1 = R 2 e - (t 1-t 2)
2. B. R 1 = R 2 e (t 1-t 2)
3. C. R 1 = R 2 (t 2/t 1)
4. D. R 1 = R 2

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