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The isotope Sr-90 is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a 0.500-g sample diminishes to 0.393 g in 10.0 y.rn-28.8 yrsrn0.127 yrsrn28.8 yrsrn0.0241 yrs
Accepted Answer
The question is about radioactive decay and its half-life. Here's how to approach it:
1. Radioactive Decay: Sr-90 decays over time, meaning its amount decreases. The rate of decay is constant and is characterized by its half-life.
2. Half-life: The half-life of a radioactive isotope is the time it takes for half of the original amount to decay.
3. Calculation: Since the strontium sample decreases from 0.500 g to 0.393 g in 10 years, we can deduce the half-life:
0.500 g / 2 = 0.250 g (half the original amount)
The sample would have decayed to 0.250 g sometime between 0 and 10 years. Since the final amount is 0.393 g, we know the half-life is greater than 10 years.
To calculate the exact half-life, we would need to use the formula for radioactive decay and solve for the half-life (t1/2).
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