| half-life equations
The half-life of 9142Mo is 15.5 minutes. If you start with 3.5 x 1022 atoms of 9142Mo, how many atoms will remain after 31 minutes?
The half-life of 31H is 12.26 years. If you start with 2.0 x 1015 atoms of 31H, how many atoms will remain after 36.78 years?
The half-life of 6932Ge is 30 hours. If you start with 3.0 X 105 atoms of 6932Ge, how many atoms will remain after 120 hours?
The half-life of 146C is 5730 years. If you start with 2.5 X 109 atoms of 146C, how many atoms will remain after 28,650 years?
The half-life of 198O is 29.1 seconds. If you start with 1.5 x 1022 atoms of 198O, how many atoms will remain after 4 minutes and 51 seconds?
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