A certain radio active substance has half-life of 38 hours. The value of k is 0.01823684211 and it takes 126 hours for 90% of the radioactivity to be dissipated. What percentage of radio active substance remains after 50 hours?

Q: You have a 5.2 mol pure sample of an unknown material. After 1.2 h, you discover that 56% has…

A: Given that                    The initial number of the moles of the sample is No = 5.2mol Since…

Q: 4.0X1018 atoms decay with a half-life of 2.3 years, how many are remaining after 3.7 years? Type the…

A: Given data: The initial number of atoms at time t=0, N0=4.0×1018. The half life of the atoms,…

Q: A sample containing I-131 has an activity of 6.40 × 108 Bq. How many days later will the sample have…

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Q: Suppose the decay constant of radioactive substance A is twice the decay constant of radioactive…

A: Given: Decay constant of A = 2× decay constant of B Half-life of B = 3 h.

Q: Att=0, a radioactive sample contains 3.50 ug of pure 11 "C, which has half-life of 20.4 min. The…

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Q: Which of the following is a form of natural radioactivity that would be deflected by a magnetic…

A: Anything that contains charge will experience magnetic force when it passes magnetic field. X rays…

Q: A man, whose lungs are on average filled with 1 liter of inhaled air, lives in a house with a radon…

A: Given(s): Average inhaled air= 1 lit. Radon gas activity, A=1.0 x10-12 Curie/liter. Require:…

Q: what is the difference between radioactivity and decay?

A: The difference between Radioactivity and Decay is as follows -  Radioactivity - Radioactivity means…

Q: The half-life of 231Pa is 3.25×104 years. How much of an initial 10.41 μg sample remains after…

A: Let the half life time of the sample is denoted by th. The formula for the disintegration constant…

Q: A radioactive sample’s half-life is 1.0 min, so each nucleus in the sample has a 50% chance of…

A: Given A radioactive sample’s half-life is 1.0 min, then each nucleus in the sample has a 50% chance…

Q: Manganese-52 has a half-life of 6 days. How many days would a scientist have to wait for the…

A: The radioactivity decay of a sample has a relationship given by:Nt=N0e-λt………(1)where,N0 is the total…

Q: 5.1 A sample of the isotope 1311, with a half-life of 8.04 days, has an activity of 10 mCi at the…

A: Given , half-life of I131 = 8.04 days Activity = 10mCi Upon receipt of I131 in medical laboratory ,…

Q: The radioactive cobalt isotope, 60Co, has an half-life of 63 months and undergoes decay. The molar…

A: Given: sample = C60o half life t1/2  = 63 months molar mass M = 59.9338222 amu initially No = 48 mg…

Q: A sample of radioisotope has a decay constant of 9.978×107 s1 and prepared with an initial activity…

A: Given: The decay constant of the radioactive sample is 9.978x10-7 s-1. The initial activity of the…

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: 10.)A radioisotope has a half-life of 5.0 days. The activity of a radioisotope sample prepared ten…

A: half life (t1/2) = 5 days Activity (A) = 6400 Bq time = 10 days

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: What's Rays Beta and Gamma ?

A: Beta decay is basically a radioactive decay in which highly energetic positive or negative rays are…

Q: A patient is injected 465 MBq of radioactive isotopes with a half life of 110 minutes. How much…

A: Given: Half life, T=110 min=6600 s Radioactive injected in a body, N0=465 MBq Let's find the…

Q: If the half-life of actinium-227 is 21.8 years, approximately how much time will be required to…

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Q: You have a 5.2 mol pure sample of an unknown material. After 1.2 h, you discover that 56% has…

A:

Q: A building has become accidentally contaminated with radioactivity. The longest-lived material in…

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Q: The half-life of 231Pa is 3.25 × 104 years. How much of an initial 10.41 µg sample remains after…

A: Given that half life of 231Pa is 3.25* 10^4 year and initial amount of sample is 10.41microgram.…

Q: If a 1.50-cm-thick piece of lead can absorb 90.0% of the γ rays from a radioactive source, how many…

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Q: The isotope of Curium 242Cm has a half-life of 160 days and emits alpha particles with an energy…

A: Half life , t12 = 160 days  E = 6.1 MeV N0 = 1018 atoms t = 80 days  To find = Power emitted

Q: A sample containing l-131 has an activity of 6.40 x 10° Bq. How many days later will the sample have…

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Q: The half-life of 18F, which is utilised in medical imaging, is 110 minutes. After 300 minutes, what…

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Q: A 162.0-mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample…

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Q: What characteristics of radioactivity show it to be nuclear in origin and not atomic?

A: Radioactivity is a type of process in which there is an emission of the particle from unstable…

Q: What isotope is produced when Np-239 emits a beta particle?

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Q: 4.3 The radioactive cobalt isotope, "Co, has an half-life of 63 months and undergoes decay. The…

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Q: A sample of plutonium-239 has a mass of 24.0 mg. If after 72300 years 6.00mg are left, what is the…

A: Given data:  Initial quantity of plutonium (N0) = 24.0 mg Time elapsed (t) = 72300 years  Remaining…

Q: Radioactivity depends on the nucleus and not the atom or its chemical state. Why, then, is one…

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Q: If the half-life of a radioisotope is 2 days, after how many days is the quantity reduced to 12.5%…

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Q: A radioactive sample was measured 9.1 years ago. It had an activity of 9783.8 Bq. Today, its…

A: Given: The intial activity of the sample is 9783.8 Bq. The final activity of the sample is 21 Bq.…

Q: A substance decays according to the formula Q = 120(0.5)"48.. (a) What is its half-life? (Do not…

A: Q= Q0  (0.5)t/T12

Q: 2) Of the main types of radiation emitted from naturally radioactive isotopes, which is the most…

A: Of the main types of radiation emitted from naturally radioactive isotopes,most penetrating is

Q: Radioactive nuclide, 9ºSr, has a half-life of 30 years. What percent of a sample of 9ºSr will remain…

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Q: Technetium-99 (half-life = 6.0 h) is used in medical imaging. How many half live would go by 36…

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Q: A 1.00 g sample of samarium emits alpha particles at a rate of 120 particles/s. The responsible…

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