A 500 g of radioactive sample has a half life of 2.5 years. How much of the initial sample will be left after 1.4 years.
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Q: 2. Consider a radioactive substance with a half-life of H = 25 days. Suppose mo = 50 mg is the…
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Q: An 1 g sample of a radioactive element takes 83.92 million years to reduce into 1 µg. Calculate the…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
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: 6. The radioactive isotope (191 Pt) has a half-life of 2.86 days. A sample containing this isotope…
A: Given, The half-life of radioactive, t1/2=2.86days Initial activity, A0=4.5×108Bq The decay…
Q: Choose the BEST answer to the following. A radioactive sample has a half-life of 1 hour. Starting…
A: The number of half -life passed in a time is,
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: What is "half-life"? Select one: a. The time needed for half of the radioactive atoms in a sample to…
A: Half-life is the duration of time needed for decay of the half of the radioactive atoms in a given…
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Q: A radioactive sample studied in a lab is found to have a half-life of 48 hours. If the initial…
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Q: Q4. A. Use the graph as shown below. Determine the half-life of Plutonium-239. Undecayed particles…
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Q: Tritium has a half-life (half-life) of 12.33 years. In a sample of tritium, what percentage of 3H…
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Q: A radioactive sample contains 1.55g of of an isotope with half a life of 3.8 days. How much of the…
A: Given data: Original amount of substance (N0) = 1.55 g Half life (T1/2) = 3.8 days Time (t) = 11.4…
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: Radon 23Rn produces a daughter nucleus that is radioactive. The daughter, in turn, produces its own…
A: To Determine: The total number of Nα and Nβ- particles that are produces in this reaction.
Q: 8. The half-life for a radioactive isotope is 4.00 × 10⁹ yr. Determine the age (in years) of a rock…
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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 isotope has a half-life of 72.0 min. A sample is prepared that has an initial activity…
A: Given Data: The half-life of a radioactive isotope is, t1/2=72.0 min The initial activity is,…
Q: A radioactive sample with a half-life of 5.3 weeks has 1.04e+15 nuclides present in the initial…
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- A sample of carbon-14 initially consists of 5 × 10 24 particles. Carbon-14 has a half- life of 5730 years. a. What is the decay constant for carbon-14? (Answer in units of yr –1 .) b. How many radioactive particles of the sample remain after 100 years? c. What percentage of the radioactive particles remains after 500 years? d. How many radioactive particles of the sample remain after 1000 years? e. How much time will it take for 50% of the particles to decay? f. How much time will it take for 99% of the particles to decay? g. How many half-lives will it take for 99% of the sample to decay? h. What is the initial decay rate of the sample? (Answer in decays/yr.) i. After 200 years, what is the decay rate of the sample? j. How long will it take for the decay rate to decrease to 1015 decays/year? k. How many half-lives have passed after the time you found in part (j)?Question 1. Tritium has a half - life of 12.33 years. What fraction of the nuclei in a tritium sample will remain (a) after 5.00 yr? (b) after 10.0 yr? (с) after 123.3 yг?What is the half‑life of an isotope that decays to 6.25%6.25% of its original activity in 24.2 h?24.2 h? half‑life:
- The curve to the right shows the radioactive decay of a particular sample of a nucleus called Element 9. A particular nucleus survives for the first 10 hours, what is the probability that particular nucleus of Element 9 will decay between 10 hours and 20 hours? N 400 - a. 50.0%. b. 75.0%. 100- c. 25.0%. d. above 98%. 5 10 15 t (in hrs) e. 86.5%.9. A rock that contains 1.2x10-12 mol of 232Th (t1/2 = 1.4x1010 yr) has 4.2x105 fission tracks, each track representing the fission of one atom of 232Th. How old is the rock?The half-life of a radioactive isotope is 6.02 hours. 25.0 Grams of this isotope is needed for an experiment. How many grams of the isotope must be ordered if 48 hours pass between the time the isotope is ordered and the start of the experiment?
- What fraction f1 of a radioactive sample will be left after 6 half‑lives? What fraction f2 of a radioactive sample will be left after 7.5 half‑lives?The amount of radioactive 40K in a 70kg person is approximately 5000Bq. A) what is the number (N) of radioactive 40K nuclei in the body? The half life of 40K is 1.25x109 years. B)What is the amount of natural potassium (in grams) in the body? The abundance of 40K is 0.012% of the natural potassium 39K