A radioactive sample took 10 years to reach 25% of its initial amount. Estimate the half life of the material.
Q: Cesium-137 is radioactive and has a half life of 30. years. Calculate the activity of a 1.4 mg…
A: Given value--- half life time = 30 year . mass = 1.4 mg. We have to find--- Calculate the…
Q: 1. The decay of radioactive substance is given by 7 N = Noe (1), where N is the number of atoms…
A:
Q: After 2.14 days, the activity of a sample of an unknown type radioactive material has decreased to…
A:
Q: Your company develops radioactive isotopes for medical applications. In your work there, you measure…
A: We know, the activity equation is given by A=A0e-λt From the table it is seen that A0=20,000 At…
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: A radioactive sample is observed for 160 days. After 160 days the amount of the sample is found to…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The rate at which this…
Q: Tritium (half-life = 12.3 yr) is used to verify the age of expensive brandies. If an old brandy…
A: Given: The half-life of tritium = 12.3 years Amount of tritium present in the old brand =1256
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: unknown radioactive element decays into non-radioactive substances. In 480 days the radioactivity of…
A:
Q: In 1991, two hikers in the Alps, between Italy and Austria, discovered the remains of a…
A: Half-life time of radioactive element is Activity is The rate of radioactive decay is Find:Time for…
Q: A radioactive sample is observed for 5 days. After 5 days the amount of the sample is found to be…
A: Radioactive decay is the process by which an unstable nucleus becomes stable. The rate at which this…
Q: 4. A radioactive sample, with an initial mass of 28 mg, has a half - life of 5 days. What is the…
A:
Q: A radioactive sample containing approximately 6.52×10¹3 radioactive nuclides has a half-life of 5730…
A: Radioactive nuclides are those nuclides that are unstable. This happens due to the mismatch between…
Q: A sample initially consists of No radioactive atoms of a single isotope. After a time, t, the number…
A:
Q: Suppose we have a sample containing 1.91 mCl of radioactive 131 (t,2 - 8.04 d). (a) How many decays…
A: Solution: Given that half-life of the sample, t1/2 = 8.04 days = 694656 s. Time for decay, t = 5week…
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: 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: What percentage of a radioactive substance remains after 7.00 half-lives have elapsed?
A: Time=7 half life
Q: What fraction of radioactive nucleus sample survive after two half-lives?
A: Half-life is the time taken by the radioactive element to become the half of the original amount as…
Q: 8. The half-life for a radioactive isotope is 4.00 × 10⁹ yr. Determine the age (in years) of a rock…
A:
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: 64 g of a radioactive substance is prepared. 105 hours later, only 16 g remains. To the nearest…
A: To the nearest hour, the radioactive half-life of the substance is 52.5hours
Q: The mass defect for potassium-40 is: -___x10-28kg. (Give your answer with 3 sig digs and do not…
A: The objective of this question is to calculate the mass defect of potassium-40. The mass defect is…
Q: How many half-lives must elapse until (a) 77% and (b) 99 % of a radioactive sample of atoms has…
A: Solution in answer, feel free to ask for clarifications if needed.
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: The number of radioactive nuclei present at the start of an experiment is 5.38 x 1015. The number…
A:
Q: A 5 g sample of a radioactive element takes 102 days to reduce into 3 g. Calculate the half-life and…
A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…
Q: A radioactive sample has a half-life of 28 mins. If the initial amount of sample was 2 g, estimate…
A: Radioactive decay takes place when an atomic nucleus becomes unstable. The rate of decay is known as…
Q: The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a…
A: Given that, Half life of the isotope, T = 140 days We know that, The half life is the time in…
Step by step
Solved in 3 steps
- The half life for the decay of carbon-14 is 5.73* 10^3 years. Suppose the activity due to the radioactive decay of the carbon-14in a tiny sample of an artifact made of wood from an archeological dig is measured to be 3.5*10^3 Bq. The activity in a similar-sized sample of fresh wood is measured to be ×9.6103 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.Solve problem 17 by using equation (2,2) and the k value determined by solving 16.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?
- the decay of a radioactive material has a count rate is 2000 decays/min. 4 hours later, the decay rate is 500 counts/min. what is the half-life?A sample of radioactive material has a half-life of 12 hours. If the initial sample contained 6.2x10¹3 radioactive nuclides estimate the number of radioactive nuclides present in the sample after 5 hours.The amount of carbon-14 found in a fossil of a tree is around 0.05% when compared to fresh wood of the same kind. Estimate the age of the fossil.
- Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to incandescence for long periods of time. Natural thorium is almost 100% 232Th, with a half-life of 1.405 x 10¹0 y. If an average lantern mantle contains 270 mg of thorium, what is its activity (in Bq)? XBq tA sample of plutonium-239 has a mass of 24.0 mg. If after 72300 years 6.00mg are left, what is the half life of this isotope?(a) At an initial time, a radioactive sample has an activity of 8.52x104 Bq. After 3.85 hours the activity is 5.42×104 Bq. (A) What is the half-life of the isotope? (B) What is the activity after an additional 3.85 hours? (A) (in s) OA: 2.285x103 (B) (in Bq) OA: 1.149x104 OB: 3.314x103 OB: 1.344x104 OC: 4.805x103 OC: 1.573x104 OD: 6.967x103 OD: 1.840x104 OE: 1.010x104 OE: 2.153x104 OF: 1.465x104 OG: 2.124x104 OF: OG: 2.519x104 2.947x104 OH: 3.080x104 OH: 3.448x104