Asked by huhhf3;q
Look at the graph of a magnesium isotope below. Radioactive Decay of Magnesium• 0.9 0.8 Fraction Remaini 0.7 0.6 0.5 0.4 0.3 0.2 0.1 10 20 30 40 50 60 70 80 90 100 110 120 130 Time (hours) What is the half-half life of this isotope? Explain how you came to this conclusion. How much of this sample will remain after 4 half-lives have passed?
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GPT-5 mini
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The half-life is 30 hours.
Reason: the half-life is the time at which the fraction remaining equals 0.5. From the graph the curve reaches 0.5 at t = 30 hours.
After 4 half-lives the fraction remaining is (1/2)^4 = 1/16 = 0.0625, i.e. 6.25% of the original sample.
Reason: the half-life is the time at which the fraction remaining equals 0.5. From the graph the curve reaches 0.5 at t = 30 hours.
After 4 half-lives the fraction remaining is (1/2)^4 = 1/16 = 0.0625, i.e. 6.25% of the original sample.
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