what percentage of the strontium-90 that was made 1945 still exsist now in the year 2021? the half-life of strontium-90 is 28,9 years. Lets assume we´re using the same date for each year

Q: The half life for the decay of carbon-14 is 5.73 × 10’ years. Suppose the activity due to the…

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Q: The radioactive decay of a sample containing an unknown radioactive isotope produced 6274…

A: Given Initial disintegration = 6274 Final disintegration = 1898 Time = 15.31 days

Q: Plutonium-239 is a byproduct of the fission reaction used to produce energy in nuclear power…

A: Given data,Half life=24400yearstime=97600years

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Q: 7) The half life of silicon is 710 years. 40 grams are present now, how much will be present in 200…

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Q: The half-life of element X is 500 years. If there are initially 8 g of X, how much will remain after…

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Q: Beginning with 1.00 g of a sample of an unknown radioactive isotope, 0.05674 g of the isotope will…

A: The answer to the following question is-

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Q: One of the radioactive isotopes used in medical treatment or analysis is iron-59. The half-life of…

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Q: The half-life of Oxygen-14 is 1.177 minutes.  You originally have 20 grams of it.  After roughly 3.5…

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Q: What is the half-lifeof radioactive element?

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Q: After 20 years, only 3.125% of the initial amount of radioactive isotope is left. What is the…

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Q: The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate…

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Q: The half-life of radioactive radium (226Ra) is 1599 years. What percent of a present amount of…

A: Chemical changes in which species amount varies linearly along with time basically obey"first-order…

Q: Barium -122 has a half life of 2 minutes. Suppose you obtain a sample weighing 10.0g and it takes 10…

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Q: If 50% (1/2)of a radioactive element remains after 4000 years, what is the half-life

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Q: The answer should be 26.7 days

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Q: The half-life of mercury-203 is 46.6 days. What percentage of mercury-203 remains in a sample after…

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Q: 1.) Carbon-14 has a half-life of 5600 years. If you had a sample of 100% carbon-14, how much would…

A: Given, carbon-14 half life with 100 % carbon-14 sample.we are asked to calculate the amount of…

Q: The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of…

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Q: If half-life of carbon-14 is 5730 years, estimate the age of a bone containing 75% of its original…

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Q: What

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Q: An old wooden bowl unearthed in an archeological dig is found to have one‑fourth of the amount of…

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Q: The half-life of radioactive chromium-51 is 28 days. If a sample of chromium-51 has a mass of 12.0…

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Q: The half-life of a radioactive isotope is 12.8 seconds. Starting with 0.960 g of this isotope, how…

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Q: A breeder reactor converts relatively stable uranium 238 into the isotope plu- tonium 239. After 15…

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Q: alues if needed for this question. grams in 1.80 seconds, what is the half-life of magnesium-20?

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Q: The half-life of Radium-226 is 1590 years. If a sample contains 300 mg, how many mg will remain…

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Q: PET scans require fluorine-18, wich is produced in a cyclotron and decays with a half-life of 1.83…

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Q: The half-life of cesium-137 is 30.2 yrs. If the initial mass of a sample is 1.00kg, how much will…

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Q: The free neutron is an unstable particle that decays into a proton. What other particle or particles…

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Q: What is the half-life of gallium-74 if 32.1 minutes are required for the activity of a sample of…

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Q: If 20% of the radioactive substance disappears in one year, find its half-life assuming exponential…

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Q: A sample of 113m In has a half life of 100 minutes. What amount of 113m In remains (in CPM) if a…

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Q: The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175…

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Q: A radioactive of an unknown element is an extremely hazardous species. If a 79 gram sample of the…

A: Given: Initial amount, a=79 g The final amount, a-x=37 Time =37.9 yr Rate constant=? half-life =?

Q: What is the half-life of Californium- 252 based on the graph below?

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Q: How much of a 24 gram sample of radium 226 will remain unchanged at the end of three half life…

A: Given, sample of radium-226 has mass of 24 gram.

Q: Radium has a half-life of 1600 years. How many years does it take for 90% of a given amount of…

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Q: The cesium-137 has a half life of 30 years after 90 years about 10g.remains. the original mass of…

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Q: 5. Strontium-90 has a half life of 28.8 years. If you start with a 10 gram sample of Strontium-90,…

A: We have to predict the amount after 115.2 years.

Q: Polonium-210 is a radioactive substance with a half-life of 138 days. If a nuclear facility is…

A: