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The Cs-131 nuclide has a half-life of 30 years. After 120 years, 8.7 g remain. What...
The radioactive isotope Cs-137 has a half-life of 30 years. Starting with 1.0 mg of Cs, how much would remain after 90 years?
The nuclide 59Fe decays by beta emission with a half-life of 44.5 days. The mass of a 59Fe atom is 58.935 u. (a) How many grams of 59Fe are in a sample that has a decay rate from that nuclide of 463 s-1? ____ g (b) After 200 days, how many grams of 59Fe remain? _____ g
A certain radioactive nuclide has a half life of 50.7 years. How long does it take for 87.5% of a sample of this substance to decay? years Submit Hide Hints Hint 1 Hint 4 Hint 3 Hint 2 What percentage of the original sample has decayed after two half lives have elapsed?
20) A 0.500-g sample of iodine-131 is obtained by a hospital. How much will remain after a period of one week? The half-life is 8.07 days.
20) A 0.500-g sample of iodine-131 is obtained by a hospital. How much will remain after a period of one week? The half-life is 8.07 days.
8. The nuclide 76 As has a half-life of 26.0 hrs. If a sample of "As weighs 344g, what mass 7As remains after 538 mins? a) b) c) d) 84g 157g 271g 365g
If C14 has a half-life of 4,000 years, what fraction will be remaining after 36,000 years? IfI 131 has a half-life of 8 days, what fraction will be left after a year?
A certain radioactive nuclide has a half life of 44.3 years. How long does it take for 87.5% of a sample of this substance to decay? years
A certain radioactive nuclide has a half life of 74.8 years. How long does it take for 87.5% of a sample of this substance to decay? ___years?
The isotope iodine-131 has a half-life of 8.1 days. A scientist places a 100gram100gram sample of iodine-131 into a sealed container that has a mass of 50grams50grams. After 8.1 days, what will the mass of the container and its contents be?