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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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