Find the half-life (in hours) of a radioactive substance that is reduced by 10 percent in 25 hours.
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: A radioactive isotope has an initial activity of 8000 decays per second (dps). If its half-life is…
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A: Given that: Decay constant of parent nucleus = k1 Decay constant of daughter nucleus = k2 y1(0)=a…
Q: A 1.61-cm panel of a certain material can absorb 85.3% of incoming rays from a radioactive source.…
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Q: After how many half-lives will (a) 10.0%, (b) 5.00%, and (c) 1.00% of a radioactive sample remain?
A: Formula to calculate the number of half-lives is,
Q: A 1.13-cm panel of a certain material can absorb 86.5% of incoming rays from a radioactive source.…
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Q: Krypton-81m (81mKr) is a radioactive isotope with a half-life of 13.1 s that is often used in…
A: The correct option is (e) 50.26 s
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: If 100 grams of a radioactive substance is left to decay, how much would be left after 5 half-lives?…
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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: 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: 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: The photoelectric work function of potassium is 2 eV. What potential difference would be applied…
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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: 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…
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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: radioactive sample initially undergoes 12.0×10^4 decays/s. Twenty-four hours later, its activity is…
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Q: In 1991, two hikers in the Alps, between Italy and Austria, discovered the remains of a…
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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: Determine the half-life (in s) of a radioactive sample that contains 1.10 x 105 atoms of the…
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Q: A certain radioactive isotope has leaked into a small stream. Three hundred days after the leak,…
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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 freshly prepared sample of a certain radioactive isotope has an activity of 3.7 × 1011 decays/s.…
A: Relation between activity of the radioactive isotope and half life…
Q: The half-life, T, for a particular radioactive element is 23 min. Find the decay rate of the…
A: The relationship between half life and decay constant is λ=0.693/t1/2
Q: Radioactive substances follow a specific law of decay. Namely, if you have a sample of some…
A: The given problem is based on radioactive decay and half life. The given equation is 128
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…
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Q: For the radioactive isotope strontium-90, k is 2.47 x 10-2 years -1. If the original amount of…
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Q: After 2 days, 10 grams of a radioactive substance s present. Three days later, 5 grams is present.…
A: GivenAfter 2 days , Radiaoactive substance (A)=10 gThree Day later , Radiaoactive substance (A)=5…
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: At time t = 0 the capacitor in the circuit is uncharged and the switch is open. (Enter your answer…
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Q: A particular radioactive material was weighed exactly 1 year ago, showing a mass of 200 g. If the…
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Q: The counting rate from a radioactive source is 4000 counts per second at time t=0. After 10 seconds,…
A: We know that activity is N=N0e-λt and T1/2=ln2λ=0.693λ Using the above formula the problem can be…
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: The two samples A and B consist of an equal number of radioactive nuclei to begin with. 5 days later…
A: From the question it is given that: Let N0 be the amount of radioactive nuclei is present in initial…
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: Tritium (half-life = 12.3 yr) is used to verify the age of expensive brandies. If an old brandy…
A: The amount remaining is equal to the original amount times 1/2 raised to the of half-lives that have…
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 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
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