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If 80 percent of radioactive

The graph below shows the radioactive decay of rubidium-87.What percentage of rubidium-87 atoms will be left after three
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The percent P of a radioactive substance remaining after time t weeks is given by the formula p = 100.(0.5)^1/20 the percent to
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2. asked by Help
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An unknown radioactive element decays into non-radioactive substances. In 420 days the radioactivity of a sample decreases by 39
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2. asked by Kim
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An unknown radioactive element decays into non-radioactive substances. In 120 days the radioactivity of a sample decreases by 59
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If 70% of a radioactive element remains radioactive after 400 million years , then what percent remains radioactive after 600
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2. asked by Alexus
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if 60% of a radioactive element remains radioactive after 300 million years, then what percent remains radioactive after 500
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2. asked by Lexi
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If 60% of a radioactive element remains radioactive after 200 million years, then what percent remains radioactive after
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2. asked by aniyah
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Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?
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2. asked by katrina
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An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a sample decreases by 64
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2. asked by Rachel
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A bond has an average return of 6.8 percent and a standard deviation of 4.6 percent. What range of returns would you expect to
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2. asked by Emi
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