A radioactive sample has a mass of 185 grams. How much remains after 2 half lives?

Q: Different nuclides of the same element have the same number of protons and the same number of…

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Q: The radioactive isotope (1Os) has a half-life of 22.1 hours. How much of 49.5 g of this isotope will…

A: If initial quantity is N0 and after t time the quantity is N then…

Q: A radioactive material initially is observed to have an activity of 1000 decays per second. If 9.0…

A: Given : A0 = 1000 decays/sec A = 100 decays/sec t = 9 hours

Q: The activity of a radioactive isotope is 16000 disintegrations/sec. The activity drops to…

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Q: Your body contains several radioactive isotopes. Approximately 20% of the radiation dose you receive…

A: Beta-decay is a process that takes place in a radioactive atom. The original nuclide is converted…

Q: One hundred kilograms of a certain radioactive substance decay to 40 kg after 10 years. How much…

A: Given data The initial mass of the radioactive substance is: Xo = 100 kg The mass of the radioactive…

Q: The material that formed the earth was created in a supernova explosion approximately 6 billion…

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Q: Radon gas has a half-life of 3.83 days. If 2.86 g of radon gas is present at time t = 0, what mass…

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Q: if you started with a parent isotope with 100% of its atoms and its half-life is 10 years. What is…

A: Given. t/T = 2 N(t) = No(1/2)t/T

Q: What is an alpha particle the same as?

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Q: What is the energy released in this nuclear reaction 199F+42He→2210Ne+11H919F+24He→1022Ne+11H? (The…

A: The expression for the nuclear reaction is,

Q: sample of radioactive material starts with 0 grams. After 3 half lives have passed, how much…

A: Half-life is the amount of time it takes for one half of a sample of a radioactive isotope to decay.…

Q: If you make an account of 1000 people born in the year 2000 and find that half of them are still…

A: An account of 1000 people are made in 2000 and half of them are still alive in 2060. But this does…

Q: What is beta positive decay or positron decay ?

A: A positive beta decay or positron decay is one in which a proton in the parent nucleus decays into a…

Q: A radioactive nuclide that has an atomic number of 53 and a mass (nucleon) number of 131 is used to…

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Q: If you start out with 20 grams of a radioactive material, and 4 hours later you have 5 grams of that…

A: Given data:  Initial amount of material (N0) = 20 g Time (t) = 4 hours Remaining amount of material…

Q: Complete the following nuclear reactions based on the conservation of nucleons: 2U + In → (?) 14N +…

A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If…

Q: Calculate the average binding energy per nucleon of , which has an atomic mass of 61.928349 u

A: The atomic mass of the element is 61.928349 u. The name of the element is Nickel. The atomic number…

Q: The radioactive isotope (183-Ta) has a half life of 5.11 days. A sample containing the isotope as an…

A: Given data: Half-life t12=5.11 days Initial activity R0=4.5×108Bq

Q: What is half-life?

A: The half life is related to the radioactivity.  The time in which the number of atoms becomes half…

Q: Suppose a radioactive material, UPinium, was found under the chemistry building in 2000 (year). In…

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Q: A sample of 1000 radioactive atoms has a 10 minute half-life. How old is the sample when 750 atoms…

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Q: Suppose you have a sample of radioactive material that decays with a time constant of 60 minutes. If…

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Q: 18. 2. The half-life of a radioactive sample is 30 minutes. If the sample originally contains 4x10°…

A: The half-life of a radioactive isotope is the amount of time it takes for one-half of the…

Q: A sample of wood from an archaeological excavation is dated by using a mass spectrometer to measure…

A: Given:in the fossil it was seen that for every 1.5×1015 atoms of 12C, there were 125 atoms of…

Q: A certain radioactive material has a half-life of 10 years. You have 80 kg of the material. After 10…

A: It is given that,

Q: Q4: - The radioactive isotope 198Au has a half-life of 64.8 h. A sample containing this isotope has…

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Q: The half-life of a radioisotope O indicates how tightly the nucleons are bound together O determines…

A: The half life of radioisotope is defined as the the amount of time taken for 50% of the original…

Q: The half-life of a certain radioactive element is such that 7/8 of a given quantity decays in 12…

A: The amount of radioactive material left after decaying for a certain time period is given by A =…

Q: A sample of an unknown radioactive isotope initially weighs 5.00 g. One year later the mass has…

A: Given that  N0=5g N=4.27 g t=1 year calculate T1/2 =?

Q: Suppose you start with 1 kilogram of a radioactivesubstance that has a half-life of 7 years. How…

A: Radioactive decay is represented by,

Q: Suppose that you are given a 200 gram sample of a radioactive substance with a half-life of 45 days.…

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Q: If 10% of a radioactive material decays in 5 days, then the amount of the original material left…

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Q: What is a nucleon?

A: Nucleons are subatomic particles present in the nucleus of atoms. The total number of nucleons in a…

Q: If a sample of a radioactive isotope has a half-life of 3 years, how much of the original sample…

A: The half-life of the sample = 3 years (a) That means, after every 3year the sample becomes half of…

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: A patient is injected with a radioactive isotope with a radiological half life of 12 days. The…

A: Option: A

Q: You are experimenting with a radioactive sample of polonium. At the end of 14.0 minutes, exactly…

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Q: What fraction f1 of a radioactive sample will be left after 3 half‑lives? f1 = ? What fraction f2…

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Q: Bismuth, 214Bi decays by alpha decay with a half-life of 19.7 minutes. What is its decay constant?

A: Half life  = t = 19.7 minutes  I minutes = 60 sec  So t = 60*19.7 t =1182 sec  The decay constant is…

Q: Radioactive isotopes often occur together in mixtures. Suppose a 100 g sample contains 131Ba, with a…

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Q: f life of a radioactive element is 29.2 vears, how many years will it take for a sample to decay to…

A: Givemhalf life of a radioactive element, t1/2= 29.2 vears

Q: 14C has an activity of 0.25 Bq per gram of carbon for living organisms. The half-life of 14C is 5730…

A: Initial activity of C14 = 0.25 Bq per gram of carbon final activity of C 14 = 0.15 Bq per gram of…

Q: Radon gas has a half-life of 3.83 days. If 2.70 g of radon gas is present at time t = 0, what mass…

A: Given: Half life, t1/2 = 3.83 days At t=0 mass of radon ,Co = 2.70 g   To determine mass of radon…