4. (p. 46, #8ab:) After 30 days of radioactive decay, 100 mg of a radioactive substance was observed to remain. After 120 days, only 30
4. (p. 46, #8ab:) After 30 days of radioactive decay, 100 mg of a radioactive substance was observed to remain. After 120 days, only 30 mg of this substance was left. (a) How much of the substance was originally present? (b) What is the halflife of this radioactive sub- stance
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