A specific radioactive material was measured to have an activity of 347 MBq at 7:00 A.M., what is the half-life of this radionuclide if at 2:00 P.M. the activity was reduced by 154 MBq?
Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…
A: Given: The half life time of thorium is t1/2=1.405×1010 y. The mass of thorium in lantern is m=300…
Q: The activity of a freshly prepared radioactive sample with a half-life of 4 days is 1000 Bq. How…
A: Given : t1/2 = 4 days No = 1000 Bq N = 250 Bq
Q: You are an archaeologist, and send some leather clothing found at a burial site to be radiocarbon…
A: The general formula for the activity as a function of time t is given by, Here, A, Ao, λ and t…
Q: Suppose that you start with 3.65 g of a pure radioactive substance and determine 19.6 h later that…
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Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…
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Q: After 2.14 days, the activity of a sample of an unknown type radioactive material has decreased to…
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Q: How many half-lives would have to elapse for a sample of a radioactive isotope to decrease from an…
A: No = 192 cpmN = 3 cpm
Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by…
A: Given Mass (m) = 1.375 g Half-life of U238 t12 = 4.47×109 years Present time…
Q: Many medical PET scans use the isotope 18F , which has a half-life of 1.8 h . A sample prepared at…
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Q: A radioactive sample with a half-life of 3.1 s initially has 10,000,000 nuclei. What would be the…
A: The activity is R=11955.3677Bq
Q: A radioactive sample has an initial activity of 6.55 x 10°Bq (1Bq is one disintegration per second).…
A: Given, initial activity N0 = 6.55 x 109 Bq After t=4 hours, activity N = 1.02 x 108 Bq Half life…
Q: If a radioactive substance has an initial activity of 0.67 Ci and a half-life of 3.0 days, what is…
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Q: A radioactive isotope has an activity of 9.27x104 Bq initially. After 3.30 hours the activity is…
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Q: Mantles for gas lanterns are made of thorium, because it forms an oxide that can survive being made…
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Q: 50Vhas one of the longest known radioactive half-lives. In a difficult experiment, a researcher…
A: N=Noe-λtNo is the number present at t=0 and λ is the decay constantλ=0.693t12The radioactive dating,…
Q: a) The half-life of iodine-125 is 59.4 days. If the initial mass of iodine-125 is 128 µg, what mass…
A: a) Given, the half-life of iodine-125 is T12=59.4days the initial mass of iodine is…
Q: Tritium has a half-life of 12.5 y against beta decay. Determine fraction of a sample which will…
A: (1) We have given Th=12.5 years Here Th= half life We know that NNo=12tTh NNo=122512.5=122=14 N=No/4…
Q: What is the half-life of an isotope that decays to 6.25% of its original activity in 60.2 h?
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Q: a sample containing l-131 has an activity of 6.4x10^8 Bq.h how many days later will the sample have…
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Q: The carbon–14 activity in papyrus growing along the Nile River today is 231 decay events per…
A: Name of element Carbon 14 Decay events per kilogram of papyrus = 231 Decay events per kilogram of…
Q: What time interval elapses while 51.0% of the radioactivity of a sample of 7233As disappears, as…
A: As per given data, 51% of the radioactivity of a sample disappears.
Q: A sample of radioisotope has a decay constant of 9.976✕10-7 s-1 and prepared with an initial…
A: Given data: The decay constant of a sample of a radioisotope is, The initial activity of a sample…
Q: Co decays with a half-life of 5.27 years to produce 8 Ni. 60 (a) What is the decay constant for the…
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Q: P239u is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of P239u present…
A: The formula for remaining nuclei in terms of half life N=N012tt1/2
Q: A radioactive sample is prepared; 10.78 hours later, only 1/16th of the original sample remains.…
A: Activity N=N0e-λt 10.78 hours later, only 1/16th of the original sample remains N016=N0e-λ10.78…
Q: What is the half-life of a radioactive isotope if the activity of a sample drops from 6,080 cpm to…
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Q: The half-life of 60?? is 5.27 years. The activity of a 60?? is 3.50 × 109 Bq. What is the mass of…
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Q: A radioactive equilibrium between 99mMo/99m Tc generator and its daughter is a transient…
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Q: A 40 grams in radionuclide decays 35 grams in 240 years. What is the half-life of the radionuclide?
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Q: 45. A 60 Co source is labeled 6.1 mCi, but its present activity is found to be 2.03x107 Bq. (a) What…
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Q: A 200.0 - mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample…
A: The time taken for the activity reduced to 20.0 mCi.
Q: A piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.19 kg…
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Q: The half life for the decay of carbon-14 is 5.73* 10^3 years. Suppose the activity due to the…
A: The half life for the decay of carbon-14 is 5.73* 10^3 years. A tiny sample of an artifact made of…
Q: gram of caesuim (55 Cs) decays by B-emission with a half life of 30 years. (a) Name the resulting…
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Q: The decay rate dt for N number of radioactive nuclei is dN dt - AN What is meant by higher decay…
A: The formula of the radio activity is where, N is the number of atoms present and is the decay…
Q: The half life for the radioactive decay of Ce-141 is 32.5 days. If the sample has an activity of 4.0…
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Q: A certain isotope has a half-life of 5.9 h and an atomic mass of 95.98 u. What will the activity in…
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Q: Many medical PET scans use the isotope 18F, which has a half-life of 1.8hr . A sample prepared at…
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Q: A radioisotope has a half-life of 5.0 days. The activity of a radioisotope sample prepared ten days…
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Q: The remains of an ancient cave were unearthed. Analysis from charcoal in the cave gave 12.0…
A: Half life is defined as the interval of time required to decay half of the nuclei of radioactive…
Q: The activity of C-14 can be used to determine the age of some archaeological discoveries. Suppose a…
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