A 840.3 ng sample of an unknown radioactive substance was placed in storage and its mass...
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A 840.3 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 105.0 ng. How many half-lives of the unknown radioactive substance have occurred? number of half-lives: Enter numeric value half-lives A 840.3 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 105.0 ng. How many half-lives of the unknown radioactive substance have occurred? number of half-lives: Enter numeric value half-lives
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