3.8. The half-life of 109Tc, a ß- emitter, is 15.8 s. a). How many atoms of 10Tc are present in a sample with an activity of 0.200 µCi. b). What is the mass of the sample?

Q: The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The…

A: Answer : Since radioactivity follows first order kinetics . Given : Half life = 14.3 days . Initial…

Q: Copper-64 is used in the form of copper acetate to study brain tumors. It has a half-life of 12.8…

A: Since we know that radioactive decy follow first order kinetics  So to solve this problem we will…

Q: What is the half-life of an isotope that is 75% decayed after 16 days?

A: Half life is a time period in which the initial amount of a substance becomes half after certain…

Q: 9.) Strontium 90 is a major component of the detonation of nuclear explosives: it is I dangerous…

A: We know that no of atoms  N Present at time t  are given as N= N° e-kt where N° are the initial…

Q: 6. Iodine – 131 is used in the form of sodium iodide to treat cancer of the thyroid. The isotope has…

A: half - life = t1/2 = ln 2λ Given that,t1/2 = 8.04 days Ao = 25 mg t = 32.2 days

Q: Phosphorus-32 is a radioactive isotope used as a tracer in the liver. How much phosphorus-32 was…

A: Radioactive decay reactions are first order reaction. Since we know that the relationship between…

Q: The half-life of 143TC, a ߯ emitter, is 15.8 s. (a) How many atoms of 43TC are present in a sample…

A:

Q: How old is a rock if the mineral biotite from the rock has 75,000 40K atoms and 25,000 40Ar atoms?…

A:

Q: 7. If we start with 1.000 g of strontium-90, 0.953 g will remain after 2 years. (a) What is the…

A: Reladioactive decay reactions are first order reactions which can be solved as follows using…

Q: Radioactivity from Chernobyl After the release ofradioactive material into the atmosphere from a…

A: Given data half life of  iodine-131 : t1/2 = 8 days safe feed : Amount of  iodine-131 left 10 % of…

Q: Strontium-90 is present in the fallout produced by nuclear weapons testing in the atmosphere. Sr-90…

A:

Q: The half-life of Uranium is 235 (U235) decaying to lead 207 (Pb 207) is 704 million years suppose an…

A:

Q: The nuclide 19O, prepared by neutron irradiation of 19F, has a half-life of 29 s.(a) How many 19O…

A: Radioactive decay follows first order kinetics.

Q: 6. 13'I is a ß emitter used as a tracer for radioimmunoassays in biological systems. Use the…

A: SOLUTION: Step 1: Hello. Since the question has multiple parts, the first three parts are solved. In…

Q: Phosphorus-32 is used in biochemical studies to follow the pathway taken by metabolites. Its…

A: (a) All the radioactive reactions are first order, thus, value of rate constant can be calculated…

Q: Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life…

A: The initial amount of Chromium-51 (No) = 30.8 mg The half-life period of Chromium-51 (t1/2) = 27.7…

Q: Radioisotope X has a half-life of 4.0 h. Based on the figure below, if the original sample of the…

A: Half life (t1/2) :-  The time required for the concentration of reactant to reduce to half of its…

Q: Radioactive cobalt-56 decays with a half-life of 77.2 days. a. What is the value of k in s12 k = b.…

A: Radioactive disintegrations always happen as per first-order kinetics in which reaction rate for…

Q: Calculate the half-life of a radioisotope if it takes 24 years for a sample to decay to 12.5% of its…

A: Radioactive decay follows first order kinetics. Half-life is the time taken by a radioisotope to…

Q: The half-life of 19TC, a ߯ emitter, is 15.8 s. 43 (a) How many atoms of 13Tc are present in a…

A:

Q: The radioisotope phosphorus-32 is used in tracers for measuning phosphorus uptake by plants. The…

A:

Q: Technetium -99 (Tc-99) is the most commonly used radiotracer in medicine. It is used to detect…

A: Decays reactions are first order reactions. Since we know that the relationship between the…

Q: The half-life of 123I is 13 hr.  How much of a  64 mg sample of 123I is left after 26 hours?

A: The isotope of iodine, 123I, undergoes decay in accordance with first order kinetics. The half-life…

Q: The half-life of cesium-137 is around 30 years, its rate of decay is proportional to the amount…

A: All decay reactions follow first order kinetics For first order reaction,   rate constant, k =…

Q: A sample of a newly discovered element, West Virginium, has a half-life of 288 years.  How long…

A:

Q: The isotope 166-Yb decays by electron capture with a half-life of 57 hrs. What percentage of the…

A: We have to calculate the percentage of isotope left

Q: Vhich of the following is the half-life ( in days Jof a radioisotope if it decays to 10.5% of its…

A:

Q: Radioactive cobalt-60 is used extensively in nuclear medicine as a x-ray source. It is made by a…

A: The rate constant (k), half lifetime t12 is connected by the following equation: k=0.693t12…

Q: A sample of (_16^35) , a ß- emitter, has an activity of 0.100 µCi. In 20.0 days, the activity of the…

A: Given data, [A] = 0.0853 μCi[A0] = 0.100  μCit = 20 days Calculating the half-life of a sample.

Q: The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 x 1010 years. Suppose…

A: Radioactive decay follows 1st order reaction kinetics. So it follows the equation of 1st order…

Q: 3. Cobalt-60 is a strong gamma emitter that has a half-life of 5.26 yr. The cobalt-60 in a…

A: Given, half life of Cobalt-60 =5.26 yr date of purchase of sample = June 2010

Q: What is the half-life (in y) of a radioisotope if it decays to 25% of its radioactivity in 13.5…

A: The formula for radioactive decay constant of a radioactive reaction is as follows :- k = 2.303t log…

Q: Phosphorus-32 is used in biochemical studies to follow the pathway taken by metabolites. Its…

A: (a) All the radioactive reactions are first order, thus, value of rate constant can be calculated…

Q: s the rate constant (in min−1) for the decomposition of fluorine-18?   min−1 (b) If a sample of…

A: Radioactive decay is first order reaction  Hence Half life = 0.693/k k-rate constant of reaction…

Q: The isotope 208Tl undergoes β decay with a half-life of 3.1 min.  How many minutes will it take for…

A:

Q: 10.6. A sample of S, a ß- emitter, has an activity of 0.100 µCi. In 20.0 days, the activity o the…

A: Given,  Initial amount, [A]0 = 0.1 µCi  Final amount, [A] = 0.0853 µCi  Time, t = 20 days

Q: The isotope 226Ra has a half-life for radioactive decay of 1600 y. How long will it take the amount…

A: Half -life for radio active decay:

Q: The half-life of 199Tc, a ߯ emitter, is 15.8 s. (a) How many atoms of 199Tc are present in a sample…

A:

Q: 3. 137Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A:

Q: The decay constant of 235U is 9.8 × 10^−10 y^−1. How many 235U atoms will remain in a 1.0 µg sample…

A: Given,

Q: 1) Co-60 is used extensively in radiotheraphy as a source of y- rays. Its half life is 5.27 years.…

A: a) Given: Its half-life is 5.27 years. The number of years does Co-60 to decrease to 35 % of its…

Q: Phosphorus-32 has a radioactive isotope used as a tracer in the liver. The half-life of…

A: All radioactive decay reactions follow first order kinetics Given  Half life of Phosphorus-32 (t1/2)…

Q: 137Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Since you have posted multiple independent questions in the same request, we will solve the first…

Q: The half-life of carbon-14, an isotope used in archaeological dating, is 5730 years. What percentage…

A: The age of the sample follows first order kinetics. This method is known as carbon dating. First…

Q: The radioactive isotope Pu-238, used in pacemakers, has a half-life of 87.7 years. If 1.9 milligrams…

A: Given : Half - life = 87.7 years Initial Pu-238 = 1.9 mg

Q: What is the half- life of a radioisotope if it decays to 12.5% of its radioactivity in 12 years?

A: Let the initial concentration of the radioactive substance be A. The concentration of the substance…

Q: Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. (a) How many beta particles are…

A: Given: Half life of beta decay= 5.26 year Time= 600s Mass of Cobalt-60= 3.75 mg

Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.