Two people are trying to push a large box across a floor. Each person pushes with an equal amount of force. The total amount of
2 answers:
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20 minutes.
The sample would lose one half the quantity of francium in each half-life.
Thus a mass decrease by a factor of 16 would correspond to a period of four half-lives. It took 80 minutes for the sample to lose all these francium, therefore
minutes.