the half-life of 131I is 8days. On a certain day, the activity of an iodine-131 sample is 6.40 mCi. What is its activity 40 days later?

Q: What mass of thallium-201 is needed to have an activity of 10 mCi? How long will it take for the…

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Q: The isotope Np-238 has a halflife of 2.0 days. If 96 were present on Monday, how much will remain…

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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: A radioactive material has a half-life of 2.5 hours. The activity of a sample was measured to be 375…

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Q: The mass of carbon in an animal bone fragment found in an archeological site is 200 g. If the bone…

A: Mass of carbon m=200 g. We know that 12 g of Carbon has 6.022*1023 Nuclei so 200 g of carbon would…

Q: Two radioactive samples, X, Y have the same number of atoms at t = 0. Their half lives are 3h and 4h…

A: The formula of the radioactivity is  R = Ro e-0.693 tT where, Ro is the initial activity, t is the…

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: After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. If an…

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Q: If a radioactive isotope of thorium (atomic number 90, mass number 232) emits 4 alpha particles and…

A: When any radioactive elements emit alpha particle, it's atomic number reduces by 2 and mass number…

Q: Bismuth-210 has a half-life of 5.01 days. The activity of a bismuth-210 sample at the start is 100…

A: Write the expression for the remaining quantity. Here, N0 represents the initial activity, t…

Q: A radioactive sample contains 3.50ug of pure 11/6 C. The half-life of 11/6 C is 20.4 minutes (take…

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Q: Radioactive indium-111 has an effective half-life of 2.5 days.If a dose with an activity of 3.0 mCi…

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Q: The activity due to 14C of a sample has a specific activity of 10.41 d/min.g. The same mass of a…

A: We know from the radioactive decay formula, t=-T120.693lnAA0 Where T12 is the half-life of the…

Q: A sample of material contains 2.00 x 1015 atoms. The sample initially consists entirely of a…

A: Let N0 denote the number of atoms of the radioactive substance A at the initial time. Let t1/2…

Q: Find the activity of a sample containing 4.73 x 1014 iodine-131 nuclei (T1/2 = 8.0 days).

A: Sample size, N=4.73 x 1014 nuclei (of iodine-131 atom) Half life, T1/2 = 8 days =8x24 hours =8x24x60…

Q: A sample of radioisotope has a decay constant of 9.978x107 s1 and prepared with an initial activity…

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Q: The radioactive nuclide Plutonium-199 has a half-life of 43.0 min. A sample is prepared that has an…

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Q: Find the activity of a sample containing 7.64 x 1014 iodine-131 nuclei (T1/2 = 8.0 days).

A: Given: Number of iodine 131 nuclei (N) = 7.64 x 1014 Half life time (t1/2) = 8 days…

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: On your birthday, you measure the activity of a sample of 210Bi, which has a half-life of 5.01 days.…

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Q: A piece of radium has an activity of 92 mCi. (a) What is the mass of the radium?

A: Given: The activity of the radium is 92 mCi. The molecular mass of the radium is 226.

Q: radioactive sample was measured 51.3 years ago. It had an activity of 8888.5 Bq. Today, its activity…

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Q: What time interval elapses while 51.0% of the radioactivity of a sample of 7233As disappears, as…

A: As per given data, 51% of the radioactivity of a sample disappears.

Q: Polonium 219 emits a beta particle. What element results and what is its mass number?

A: The emission of beta particle results in the original mass number remaining same and the atomic…

Q: Find the activity of a sample containing 8.53  1014 iodine-131 nuclei (T1/2 = 8.0 days).

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Q: Radioactive iodine isotope I of half-life 8.0 days is used for the treatment of hyroid gland cancer.…

A: activity = rate of disintegration             = λ(dN/dt)

Q: A radioactive material produces 1280 decays per minute at one time, and 4.6h later produces 320…

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Q: The half-life of 43100Tc, a ß- emitter, is 15.8 s. a). How many atoms of 43100Tc are present in a…

A: Half life of decay = 15.8 Activity of sample = 0.2×10-6 = 3.7×1010 ×0.2×10-6 = 7400Bq

Q: The radioactive isotope Gold -198 has a half of 64.80hours. A sample containing this isotope has an…

A: The initial activity is given by,

Q: The nuclide 198Au, with a half-life of 2.70 d, is used in cancer therapy.What mass of this nuclide…

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Q: A 200.0 - mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample…

A: The time taken for the activity reduced to 20.0 mCi.

Q: What is the binding energy per nucleon of the tritium (H3) nucleus (1u=931.5 MeV; Tritium atomic…

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Q: the decay of a radioactive material has a count rate is 2000 decays/min.  4 hours later, the decay…

A: Given:- the decay of a radioactive material has a count rate is 2000 decays/min.  4 hours later, the…

Q: Find the activity of a sample containing 4.84  1014 iodine-131 nuclei (T1/2 = 8.0 days).

A: For radioactive elements activity is the measurement of the number of unstable nuclei that decay per…

Q: 1.The half life of radium - 226 isn1. 8×10^3 years. a. What is the activity in Curries of 3.00 g…

A: (a) The expression for the half-life is written as, Here, λ represents the decay constant.

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

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Q: If the atomic mass of Sodium-18 is 18.02597 u, what is the binding energy?

A: Please note : As per answering guideliens I can answer the first question only. Since,,this is not a…

Q: It is known that the initial number of atoms in a radioactive sample is No = 4.0 x 108 atoms. If the…

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Q: A technician was accidentally exposed to potassium-42 while doing some brain scans for possible…

A: Activity after 36 hours = 2 micro Ci half life = 12 hr time = 36 hr

Q: 9 lodine-131 (131 I) is a radioactive isotope with a decay constant of 9.9 × 10-7s-1. (b) Some water…

A: decay constant of I-131 (λ) = 9.9×10-7 s-1

Q: Chromium's radioactive isotope 51Cr has a half-life of 27.7 days and is often used in nuclear…

A: Let t1/2 be the half-life of the chromium’s radioactive isotope and A0 be the initial activity.

Q: A piece of radium has an activity of 92 mCi. (b) What is its activity in Bq?

A: given thatactivity of radium=92 mCiwe know that1 mCi=37000000 Bq

Q: The radioactive nuclide plutonium 199 has a half life of 43.0min.A sample is prepared that has an…

A: i. the decay constant can be calculated as follows,

Q: Gallium citrate, which contains the radioactive nuclide 67Ga, is used in medicine as a tumor-seeking…

A: Let t be the time and t1/2 be the half-life time. t1/2 = 77.9 h Let the initial quantity of…

Q: A beta particle is emitted when carbon-14 transforms in to a nitrogen-14 nucleus. The atomic mass…

A: Atomic mass of Carbon-14 MC=14.003242 u and atomic mass of Nitrogen-14 MN=14.003074 u. The reaction…

Q: Chromium's radioactive isotope 51Cr has a half-life of 27.7 days and is often used in nuclear…

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Q: The isotope 99Tc*, which has a half-life of 6.0 h, is used in medical diagnostic procedures such as…

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Nuclear Reactions

Nuclear reactions are processes in which the fundamental characteristics of a nucleus changes. They change into a completely different nucleus. These processes occur naturally in an unstable nucleus. Bombarding an energetic particle can induce nuclear reactions.  In this article, both the naturally occurring nuclear reactions are termed as radioactive decay and the induced nuclear reactions are further categorized as nuclear fission and nuclear fusion.