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A rubidium isotope has a half-life of almost 50 billion years. Given that scientists estimate Earth's age to be 4.6 billion years, what is the most likely percentage of parent to daughter isotopes of this element currently existing on Earth?
Weegy: C. 23.5?. Currently, Earth's tilt is closest to 23.5?. User: Which of the following processes causes the greatest loss of mass within an atom? A. Alpha decay B. Beta decay C. Electron capture D. Gamma emission Weegy: A. Alpha decay (More)
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Asked 8/8/2012 11:53:37 PM
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The half-life of carbon-14 is 5,730 years. How many grams of parent material will remain from a 100-gram sample of carbon-14 after 2 half-lives? A.75 B.6.25 C.12.5 D. 25
Weegy: A.75 User: Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of potassium-40 contains one-fourth the original amount of parent isotope? a. 1.25 billion b. 2.5 billion c. 3.75 billion d. 5 billion Weegy: b. 2.5 billion (More)
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Asked 8/9/2012 12:14:59 AM
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You are given a box of 100 silver dollars, all facing "heads" up. You are instructed to shake the box 3 times; after each shake, you will remove all the dollars that are "heads up" before shaking again. You may keep all the dollars that are still tails up following the third shake. How many dollars will you most likely get to keep?
Weegy: 12 silver dollars. User: Scientists estimate Earth's age to be 4.6 billion years. Samarium has a half-life of approximately 106 billion years. From the present date, approximately how many more years must pass before a sample of samarium that was created at the beginning of Earth's history contains 50 percent of the original parent material? a. 1 billion b. 10 billion c. 100 billion d. 1,000 billion Weegy: c. 100 ... (More)
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Asked 8/9/2012 12:10:35 AM
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