The cadmium isotope 109Cd has a half-life of 462 days. A sample begins with 1.0×1012109Cd atoms...
The cadmium isotope 109Cd has a half-life of 462 days. A sample begins with 1.0×1012109Cd atoms How many 109Cd atoms are left in the sample after 340 days? How many 109Cd atoms are left in the sample after 5200 days?
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The cadmium isotope 109Cd has a half-life of 462 days. A sample
begins with 1.0×1012109Cd atoms...
The Cadmium isotope 109Cd is radioactive. A sample begins decay with 1012 Cd atoms. After 500...
The Cadmium isotope 109Cd is radioactive. A sample begins decay with 1012 Cd atoms. After 500 days, 4.7 x 1011 atoms remain. What is the half-life of this sample? (a) 46 days (b) 102 days (c) 459 days -- right answer but not sure how to get it (d) 662 days (e) none of the above
The barium isotope 133Ba has a half-life of 10.5 years. A sample begins with 1.1×1010 133Ba...
The barium isotope 133Ba has a half-life of 10.5 years. A sample begins with 1.1×1010 133Ba atoms. How many are 133Ba atoms left in the sample after 4 years. Express your answer using two significant figures. How many are 133Ba atoms left in the sample after 30 years. Express your answer using two significant figures. How many are 133Ba atoms left in the sample after 190 years. Express your answer using two significant figures.
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137...
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
If the half life of an isotope is 6 days and 120 grams of the isotope...
If the half life of an isotope is 6 days and 120 grams of the isotope is initially available, how many grams of the isotope remains after 30 days? 0.94 grams 7.5 grams 3.75 grams 1.87 grams
If a radioactive isotope has half-life h, then the number of atoms in a sample is...
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
A Radioactive sample contains 2.1g of an isotope with a half- life of 3.8 days. How...
A Radioactive sample contains 2.1g of an isotope with a half- life of 3.8 days. How much of the isotope in grams will remain after 10.0 days? Express the answer to 3 significant figures.
1. The half-life of an isotope of phosphorus is 14.2 days. If a sample contains 3.96e16...
1. The half-life of an isotope of phosphorus is 14.2 days. If a sample contains 3.96e16 such nuclei, determine its activity.? 2. A 234-mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample has a half-life of 17.4 days, how long will it keep before its activity is reduced to 28.9 mCi?
The half-life of a radioactive isotope is 220 d. How many days would it take for...
The half-life of a radioactive isotope is 220 d. How many days would it take for the decay rate of a sample of this isotope to fall to 0.47 of its initial rate?
The half-life of an isotope of phosphorus is 14 days. How much of 40 grams of...
The half-life of an isotope of phosphorus is 14 days. How much of 40 grams of phosphorus would be left after 42 days? 5g LO 20 g 10 g 2.5 g
An isotope of sodium, 24Na, has a half-life of 15 hours. A sample of this isotope...
An isotope of sodium, 24Na, has a half-life of 15 hours. A sample of this isotope has mass 9 g. (a) Find the amount remaining after 60 hours. 0.888 X 9 (b) Find the amount remaining after thours. y = (c) Estimate the amount remaining after 4 days. (Round your answer to three decimal places.) 9 (d) Use a graph to estimate the time required for the mass to be reduced to 0.01 g. (Round your answer to one decimal...
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
The half-life of an isotope of phosphorus is 14 days. How much of 40 grams of phosphorus would be left after 42 days? 5g LO 20 g 10 g 2.5 g
An isotope of sodium, 24Na, has a half-life of 15 hours. A sample of this isotope has mass 9 g. (a) Find the amount remaining after 60 hours. 0.888 X 9 (b) Find the amount remaining after thours. y = (c) Estimate the amount remaining after 4 days. (Round your answer to three decimal places.) 9 (d) Use a graph to estimate the time required for the mass to be reduced to 0.01 g. (Round your answer to one decimal...
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