Physics > Solutions Guide > Coconut Creek High School PHYSICS 20033800 7.05 KM physics (All)
Coconut Creek High School PHYSICS 20033800 7.05 KM physics
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Part 1 1. The graph above represents the nuclear decay of a radioactive element, measured using a radiation-detecting device. What is the half-life, in days, of this hypothetical element? The half-... life is 2 days. 2. If the half-life of a given substance is 65 days, how long will it take for a 100-gram sample of the substance to decay until there is only 25 grams of the radioactive material remaining? It will take 2 half-lives which is 130 days. 3. If a sample of radioactive isotopes takes 60 minutes to decay from 200 grams to 50 grams, what is the half-life of the isotope? Hint: First, determine how many times the sample has lost half of its mass, which tells you how many half-life cycles have occurred. The half-life is 30 minutes and 2 cycles have occurred. 4. If a 500.0 g sample of technetium-99 decays to 62.5 g of technetium-99 remaining in 639,000 years, what is the half-life of technetium-99? The half-life of technetium-99 is 213,000 years. 800/2 400/2 200/2 100g h= 3 h = time passed/time of a half-life 3= 639,000/x; x= 639,000/3 = 213,000 years Part 2 [Show More]
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