A 5 g sample of a radioactive element takes 102 days to reduce into 3 g. Calculate the half-life and identify the element.
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: A nucleus of radius 3.26 fm contains 10 neutrons. Identify the element by name (not symbol). Use…
A: Given : Radius of nucleus (R) = 3.26 fm No. of neutrons (N) = 10
Q: The half-life of a particular element is 330 days. What is its decay constant?
A: The relationship between Half life t1/2 and decay constant λ is t1/2=ln2λ=0.693λ where ln2 is…
Q: Tritium, or 3H, has a half-life of 12.32 years. Imagine a sample of tritium is prepared. (a) What…
A: half life = 12.32 years Original number of nuclei = No
Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…
A: Number of Thorium nuclei in 390mg of thorium is N = 60.2*1023/mol/232g/mol *(390*10-3g) =…
Q: After 2.14 days, the activity of a sample of an unknown type radioactive material has decreased to…
A:
Q: 09:1 g of medium is reduced by 2.1 mg in 5 years by a-decay. Calculate the half life period of…
A: Given The initial mass of radiation Ao = 1g Mass of radiation left after 5 years (A) = 2.1 mg =…
Q: The corresponding graph shows a group of points (a, b, c, d), which represent the number of original…
A:
Q: A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This…
A: The age of the rock is 1.36 x 10¹⁰ years
Q: After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. If an…
A:
Q: If 100 grams of a radioactive substance is left to decay, how much would be left after 5 half-lives?…
A:
Q: if you started with a parent isotope with 100% of its atoms and its half-life is 10 years. What is…
A: Given. t/T = 2 N(t) = No(1/2)t/T
Q: The isotopes of U8 and U5 occur in nature in the ratio 140 : 1. Assuming that at the time of earth's…
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Q: What fraction of a radioactive sample is left after exactly 6 half lives? Give your answer to 3…
A: Number of half life (n) = 6
Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…
A:
Q: Q1(i). The half-life of 20kg of Bismuth-210 is 20 minutes. Explain this statement. (ii). A…
A: (i) Given: Mass of Bi-210 is 20kg. The half life is 20min. Explanation: Half life is the time…
Q: The nucleus (15 8) O has a half-life of 122.2 s; (19 8) O has a half-life of 26.9 s. Assume that at…
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Q: The half-life of radon-222 is about 3.823 days. (a) Determine the decay constant for radon-222. s -1…
A: Given data: The half life of randon-222 is t1/2=3.823 days=330307.2 s Part a: The expression for…
Q: Two radioactive nuclides, A and B, are presented at t = 0 with the number of nuclei of A equal twice…
A: At , t = 0 , the number of A nuclei is twice the no of B nuclei. Na(0) = 2× Nb(0) The lifetime of…
Q: Mantles for gas lanterns are made of thorium, because it forms an oxide that can survive being made…
A:
Q: 14. Lead has four isotopes, with the following atomic masses and relative abundances: 203.973 amu…
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Q: half-life of the isotope of iodine I-131 is 8 days. The activity of the sample at the moment is…
A: 1 Ci = 3.7 × 1010 decay/s Half life T1/2 = 8 days = 8 × 24 × 60 × 60 s = 6.912 × 105 s Rate of…
Q: The nucleus (15 8) O has a half-life of 122.2 s; (19 8) O has a half-life of 26.9 s. Assume that at…
A: The following data are given:
Q: The half-life of a particular element is 330 days. What is its decay constant?
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Q: Suppose Radon gas is trapped in a basement after renovations. The half life of radon gas Is 3.8235…
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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: B) Calculate the average nuclear binding energy of 13AL nucleus, knowing that the mass defect of…
A: Given data: The mass defect of A1328lnucleus, ∆m=0.24136 a.m.u. 1 a.m.u=1.6605×10-27 kg. 1…
Q: In a lab a radioactive sample is studied for 5 days. It was observed that the radioactive nuclides…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The decay process is…
Q: A radioactive sample studied in a lab is found to have a half-life of 48 hours. If the initial…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The half-life for a…
Q: After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. If an…
A:
Q: Use the equation for radioactive decay and solve for an algebraic expression for the time, “t” in…
A: Heavier nucleus are unstable. This is because there is increase in number of protons. This increase…
Q: Tritium has a half-life (half-life) of 12.33 years. In a sample of tritium, what percentage of 3H…
A:
Q: The half-life of a radioactive isotope is known to be exactly 1 h. a) What fraction of a sample…
A: Given in question - Half-life (T) = 1 hour Solution: Step1 - Here we will understand the concept…
Q: The half-life of iodine-131 is 8 days. How long does it take for the initial activity of 4500 kBq /…
A: half life of iodine 131 = 8 days Initial activity (Ao) = 4500 kBqm3Final activity (A) = 65 kBqm3
Q: Question 84 ."Radium being a member of the uranium series occurs in uranium ores. If the half lives…
A: Solution:-Given thatHalf life of uranium (t12)=4.5×109 yearsHalf life of radium (t'12)=1620 years
Q: The nucleus O has a half-life of 122.2 s; 0 has a half-life of 26.9 s. Assume, that at some time a…
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Q: Cadmium-107 has a half life of 6.52 hours. If you start off with sample which has an activity of 1.0…
A: The reactivity of the sample after time t is given by:
Q: A 10 g sample of a radioactive element took 12 days to reduce into 1 g. Calculate the half-life and…
A: Some configurations of protons and neutrons inside a nucleus are unstable. When an atomic nucleus is…
Q: A radioactive sample studied in a lab is found to have a half-life of 25 hours. If the initial…
A: Radioactive decay is the process by which an unstable atomic nucleus spontaneously emits particles…
Q: A radioactive equilibrium between 99mMo/99m Tc generator and its daughter is a transient…
A:
Q: A 10 g sample of a radioactive element takes 16.21 mins to reduce into 6 g. Calculate the half-life…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
Q: The half-life of radon-222 is 2.8 days. How many days would it take for the activity due to radon in…
A: Given that:- Half life of radon-222=2.8 days
- Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to a mismatch between the number of neutrons and protons. Only a few configurations of neutrons and protons are stable.
- This decay will be exponential in nature and is given by,
Here N0 is the original number of radioactive nuclei present, t is the time, and t1/2 is the half-life of the radioactive sample. This is known as the exponential law of radioactive decay.
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