Which of the following affects the half life of a radioactive sample? A the age of sample B, the size of the sample  C. The temperature of the sample D. None of these

Q: If the initial sample is  1.25 g,  what mass of the original iridium‑192 remains after  65  days?…

A: According to the question we have, Initial mass (original mass) of the sample= Mo = 1.25 g Time (t)…

Q: Find the initial amount of a radioactive element with a half-life of 21.7 hours, when the remaining…

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Q: Torgeir is on a geology field trip and finds a meteorite that contains 10 times more argon-40 than…

A: Radioactive decay of material follows first order kinetics.  Half life is defined as the time…

Q: What is the half-lifeof radioactive element?

A: Breaking down of atomic nuclei of any radioactive substance gives the radiative emissions from…

Q: s the mode of decay for strontium-81 ?

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Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Since this is a first order decay The rate constant with half life is given by…

Q: A medical technician is working with the four samples of radionuclides listed in the table below.…

A: Given  Sample = 2umol Decreases by 1/8

Q: [Review Topics] [References] Use the References to access important values if needed for this…

A: N0 = 54.7 microgram  N(t) = 6.84 microgram t = 39.9 hrs. t1/2 = ?

Q: Half-life of Element X mass How much of the daughter product exists after 2 half-lives? of 60…

A: Answer :-  Amount of daughter element after 2 Half lives = 25%…

Q: Choose the appropriate drop-down to complete the paragraph. Gallium-67 has a half life of 78.1 hours…

A: lf life of Galium-67 = 78.1 hours lf life of Radium- 226= 1600 years

Q: beta, gamma, alpha,  Electron Capture, positron emission?

A: N/P RATIO HIGH : NO OF NEUTRONS ARE MORE N/P RATIO HIGH : NO OF NEUTRONS ARE LESS N/P RATIO IS ONE…

Q: Look at the figure below. In the mineral specimen represented here, radioactive parent atoms (red)…

A: HALF- LIFE PERIOD: In radioactivity, half- life period is defined as the time period required for a…

Q: A rock containing 238U and 206Pb was examined to determine its approximate age. The sample of a rock…

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Q: The half-life of tritium is 12.32 yrs. If 49.1 mg of tritium remains of a sample with an initial…

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Q: The radioactive isotope carbon-14 is used for radiocarbon dating. The half-life of carbon-14 is…

A: Let is consider first order decay kinetics  Nt =  Noexp(-kt) Where, Nt = activity after time t No =…

Q: [Review Topics] [References] Use the References to access important values if needed for this…

A: Interpretation -  To determine the the age of the artifact , when a radioactive isotope carbon-14…

Q: The half-life of a certain radioactive element is 800 years. How old is an object if only 12.5% of…

A: Given, Half Life t1/2 = 800 years. A = 12.5%  Ao = 100 %  Time , t = ?

Q: The half-life of tritium is 12.32 yrs.If 49.1 mg of tritium remains of a sample with an initial mass…

A: The question is based on the concept of chemical kinetics. we have to calculate how much time has…

Q: A radioactive sample contains 1.55 g of an isotope with ahalf-life of 3.8 days. What mass of the…

A: Radioactive isotopes may occur naturally or be artificially produced. Radioactive isotopes possess…

Q: How much time will be required for a sample of H-3 to lose 75% of its radioactivity? The half-life…

A: The rate of radioactive decay is often characterized by the half-life of a radioisotope. Half-life…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Calculate the value of rate constant (k):

Q: Half life iridium 192 is 106.51 days. How many days are required for 60 mg to decay to 7.5 mg

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Q: initial activity of the sa

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Q: The half life of 52Fe is 8.28 hours. Suppose we measure the activity of a sample containing 52Fe and…

A: Calculation of disintegration constant (λ):T1/2 of 52Fe is = 8.28 hours.

Q: If the initial sample is  1.25 g,  what mass of the original iridium‑192 remains after  65  days?…

A: Given, mass of sample = 1.25 g time, t = 65 days mass remained =0.675 g

Q: The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 109…

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Q: 28. Number of neutrons decreases during ___? a. corrosion b. alpha emmision. c. electron capture…

A: Answer is: b. alpha emmision.

Q: The radioactive nuclide 60Co as a half-life of 5.27 years. Calculate the mass (in g) of "Co that…

A: Formula: N=Noe-λt

Q: A sample contains 9,000 particles of the original isotope for every 63,000 particles of the daughter…

A: Given data : Half-life of the original isotope (t1/2) = 19 years Also given that, the sample…

Q: 13. Starting with Uranium 238, write the nuclear equations for ( ) i. Alpha Decay i. Beta Decay

A: Soddy-Fajans' Group Displacement Rule :- Two scientist Soddy and Fajans had arrived this law at the…

Q: Question 5. (a) A series of radioactive elements are placed separately beneath the main periodic…

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Q: An unknown radioactive element decays into non-radioactive substances. In 340 days the radioactivity…

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Q: A radioactive sample contains 2.45g. How much willl remain after 11.4 days? (Half life is 3.8 days)

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Q: A medical technician is working with the four samples of radionuclides listed in the table below.…

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Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.30 billion years old by…

A: Given: Age of rock = 4.30 billion years = 4.30 X 109 years Final mass of 238U remaining = 1.325 g…

Q: 21. Half-Life The half-life of radium-226 is approximately 1620 years. a. How much of a sample…

A: Introduction: We know that this decay of radioactive elements is a type of first-order reaction. The…

Q: , radioactive

A: When an element removed beta particle then it's moves towards right side in the periodic table and…

Q: Regarding positron decay: a. What is a positron? Give an example of an isotope that decays by this…

A: Part APositron (β+) is an anti-electron particle having a charge same as that of electron but of…

Q: True or false? During one half-life, the mass of a radioisotope is reduced by half. Explain.

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Q: carbon-14 activity

A: Given data, Basic equation is Ae = Ao x 0.5 (t / t1/2)   Therefore,

Q: The difference between the calculated and experimentally measured masses of an atom is called…

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Q: 12. A year ago there were 4 grams of a radioactive substance. Now there are 3 grams. How much was…

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Q: The half life of radium-226 is 1600 years. How many grams of a 0.25g sample will remain after 4800…

A: After decying the nucleus it emits radiation of electromagnetic rays ,of certain Wavelength.

Q: The radioactive isotope *Pa decays by beta emission. 234 If the mass of a sample of protactinium-234…

A: Initial mass of isotope M = 83.5 ug Final mass of isotope M' = 20.9 ug  Time of decay t = 13.5 hours…

Q: The radioactive isotope carbon-14 is used for radiocarbon dating. The half-life of carbon-14 is…

A:

Q: It takes 6400 years for one gram of a radioactive element to decay away to only 1/16 of a gram. The…

A: Given time = 6400 years M/M० = 1/16

Q: One way to convert lead into gold is to irradiate 206Pb with neutrons. There are several steps in…

A: The lead can be converted into gold by bombarding the three neutrons with the lead nucleus producing…

Q: Strontium-90 has a half life of 28 years. If a 5.31 mg sample was stored for 112 years, what mass of…

A: Reaction in which rate is linearly depend upon one reactant is known as first order reaction.

Q: alpha- particles cannot pass through thick sheets of metals because?

A: Radioactive Substance emitted three type of particles, called radioactive particles , these are -…