archaeologist sometime in the future analyzes the iron used in an old building. The iron contains tiny amouns of nickel-63, with a half-life of 92 years. On the basis of the amount of nickel-63 and its decay products found, it is estimated that about 0.78% (1/128) of the original nickel-63 remains.  How many half lives have passed to leave only 0.78% (1/128) of the original amount?   If the building was constructed in 1980, in what year did the archaeologist make the discovery

Q: Mantles for gas lanterns contain thorium, because it forms an oxide that can survive being heated to…

A: Given: The half life time of thorium is t1/2=1.405×1010 y. The mass of thorium in lantern is m=300…

Q: A particular radioactive material was weighed exactly 1 year ago, showing a mass of 200 g. If the…

A: Given: Mo=200 gM=23.0 gt=1 year = 365 days

Q: A certain radioactive nuclide decays with a disintegration constant of 0.0256 h1 (a) Calculate the…

A: Given(s): Decay constant, λ=0.0256 h-1 Require: Half-life, t12=? Fraction of sample left after,…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by…

A:

Q: Plutonium-239 has a half life of 24100 yr. Starting with a sample of pure 239 Pu, how long would it…

A:

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

A:

Q: radioactive

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Q: The half-life of radium-226 is 1600 years. Suppose we have a 55 mg sample. Find a function that…

A: Write the expression for the radioactive decay model for the function that models the mass m(t)…

Q: If there are 20 mmol of the radioactive isotope 3H (half-life 12 years) at t = 0, how much 3H remain…

A: Initial concentration of radioactive element  is Half-life time is Find:(a) Concentration of at…

Q: Material found with the body had a C-14 activity of about 0.215 Bq per gram of carbon, where the A0…

A: The half life is t1/2=5730 yrs

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

A:

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: According to the data given Half life is 3hr And relationship given is . N(t) = N0 e(-t/£)

Q: A sample of radioactive nuclei has N0 nuclei at time t = 0. The half-life of the decay is T1/2. In…

A: Activity is, R=-∆N∆t

Q: The number of radioactive atoms in a sample decay as the emission of radiation proceeds and this may…

A: Let original number of atoms = NoLet the number of atoms present after time "t" = N

Q: An 1 g sample of a radioactive element takes 83.92 million years to reduce into 1 µg. Calculate the…

A: Radioactive decay takes place when an unstable nucleus becomes stable. The instability arises due to…

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: 3. An ancient club is found that contains 150 g of pure carbon and has an activity of 5.5 decays per…

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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…

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Q: The main dangerous radioactive material left over after the Chernobyl disaster is Caesium-137. The…

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Q: The atomic mass of iron, Fe, is 55.9349 u and the mass of Hydrogen, mH=1.007825 u and the mass of…

A: It is found that mass of the nucleus is less than the sum of all the nucleons. This mass is used as…

Q: The radiocarbon content of 14C decreases after the death of a living system with a half-life of 5730…

A: The formula of the radioactivity is given below where, T is the half life, t is the time, Ro is the…

Q: Radon-222 has a half-life of 3.8 days. What mass of radon-222 would have a decay rate of 2220 Bq?…

A: We use the formula of rate of decay to get the required values.

Q: A radioactive sample containing approximately 6.52×10¹3 radioactive nuclides has a half-life of 5730…

A: Radioactive nuclides are those nuclides that are unstable. This happens due to the mismatch between…

Q: The nucleus 10 4Be undergoes β- decay. The atomic mass of 10 4Be is 10.013535 u. (a) How much…

A: (a) 10Be radiates a β-particle and decays to 10B spontaneously. Let M, M0 and M1 denote the masses…

Q: Assume that the decay rate for Carbon 14 is k=0.00012. If charcoal found in an ancient fire pit…

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

A:

Q: Consider a fictional radioisotope X (311.1766 amu) a. If a 0.750 g sample of X-311 releases 5.75 x…

A: Given that:Atomic mass, M=311.1766 amua) m=0.750 g=0.750×10-3 kgN=5.75×1016Mass of alpha particle,…

Q: Radioactive 214^83 Bi has a half-life of 19.9 min if the activity of the radionuclide 1.2 hours…

A:

Q: Suppose we have a sample containing 1.91 mCl of radioactive 131 (t,2 - 8.04 d). (a) How many decays…

A: Solution: Given that half-life of the sample, t1/2 = 8.04 days = 694656 s. Time for decay, t = 5week…

Q: Carbon is one of the fundamental elements in everything that's alive on Earth. The three naturally…

A: Carbon has generally three isotopes found in nature. Isotopes are those which have the same proton…

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: 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: Tritium, or hydrogen-3, is formed in the upper atmosphere by cosmic rays, similar to the formation…

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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: Half life of C-14  T1/2= yearsinitial activity of sample A0= BqActivity of sample At = Bq

Q: radioactive

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Q: In a piece of rock from the Moon, the Rb content is assayed to be 1.89×1010 atoms per gram of…

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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: Potassium-argon dating is used to measure the age of rocks formed from cooled lava by determining…

A: The radioactive dating of rocks formed from cooled lava is determined by using parallel decay of…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.90 billion years old by…

A: Given, Half-life of U238 is 4.47 ×109 years

Q: What is the mass of 25.0 mCi of technetium-99m (Tc99m)Tc99m , which has a half-life of 6.00 h?

A:

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.