The radioactive gas krypton-85, produced by nuclear power plants as well as volcanoes, is present in trace amounts in earth’s atmosphere. Its half-life is 10.8 years. Suppose a volcano released 250 g of krypton-85 in an eruption. How much would remain after (a) 10.8 years, (b) 15 years, and (c) 50 years? Round to the nearest tenth of a gram.

Q: Uranium-238 (U-238) has a​ half-life of 4.5 billion years. Geologists find a rock containing a…

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Q: The half-life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

A: Activity of sample of fresh wood A0=69 BqActivity of sample of wood At=65 BqHalf life t1/2=  years

Q: When we talk about radioactive decay, we often talk about a half-life, i.e. the amount of time it…

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Q: 1. The decay of radioactive substance is given by 7 N = Noe (1), where N is the number of atoms…

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Q: The half-life for a particular isotope is 5 seconds. Suppose there are initially 380 grams present…

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Q: If the half-life of Uranium 235 is 700 million years, what would its third-life be?

A: Given data: The half life of Uranium 235 is t1/2=700 million years.   The expression for the…

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: The half life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the…

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Q: QUESTION 3 Suppose the second mass at (-8,-6) was 4 kg rather than 2 kg, in that case, what would be…

A: Gravitational force of attraction between two objects with mass m1 and m2 and distance between them…

Q: archaeologist sometime in the future analyzes the iron used in an old building. The iron contains…

A: half life of Ni -63  t/2 = 92 years LET x half life passed (N0 /2)X =( N0 / 128 ) = (N0 /2)7  X = 7…

Q: At the beginning of an experiment, a scientist has 336 grams of radioactive goo. After 60 minutes,…

A: Given data: The initial mass of the radioactive goo is, M0 = 336 gram The final mass of the…

Q: A thyroid cancer patient is given a dosage of 131I (half-life = 8.1 d). What fraction of the dosage…

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Q: A radioactive material has a half life of 4.6 minutes.  After 8.1 minutes, which percentage of the…

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Q: Estimate the radius of a sphere that would hold all of a person's mass if its density equaled the…

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Q: The hot liquid magma of molten earth was on full display in Mauna Loa as it has been actively…

A: Given:   Potassium-40, uranium-238, and thorium-232 have half-lives of 1.25 billion, 4 billion, and…

Q: If the delta variant  death rate per day (Po) peaked at 2000 in late September and declined at the…

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Q: A) How much mass is left in a piece of animal skin after 17,145 years when a newly made piece of…

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Q: A radioactive sample contains 2048 nuclie. How many of its nuclei decay after two half lives?

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Q: Uranium has a half-life of 4.47 billion years! How long does it take for a sample of 100 grams to…

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Q: Sr-90 is a byproduct of nuclear reactions inside nuclear reactor and a has a half-life of 29 years.…

A: Some configurations of protons and neutrons inside a nucleus are unstable. When an atomic nucleus is…

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: 2. A person on a diet loses 2 kg per week. Find the average rate of mass loss in milligrams every:…

A: Losses mass (m) = 2 Kg = 2000000 miligramTime (t) = 1 week = 7 days = 604800 seconds

Q: Problem 9:   Answer the following questions based on the graph of a radioactive iodine isotope shown…

A: (a) The half life of the material in days  Half-life is the time in which the 50 percent of iodine…

Q: The advertising for a new genetic screening of fetuses, through sampling the mother's blood, claims…

A: Accuracy of a lab result (P)= 99.9% Number of tests done in a year = 4 million

Q: A radioactive sample at a lab contains a mixture of 223Ra and 47Ca. There are initially twice as…

A: apply the concept of radioactive decay and use the decay equations for each isotope.The decay…

Q: An object is placed 15 cm in front of a converging lens with a focal length of 10 cm. Answer the…

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Q: 8. The half-life for a radioactive isotope is 4.00 × 10⁹ yr. Determine the age (in years) of a rock…

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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

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.