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Time left 2:21:23 The half-life of strontium -90 is 28 years. If we start with a sample of 260 mg how long until there is
Time left 2:21:23
The half-life of strontium -90 is 28 years. If we start with a sample of 260 mg how long until there is only 125 mg left ?
Select one:
a.30.2 yrs
b.6.73 yrs
c.29.6yrs
d.27.8yrs
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