After 2 hours, a radioactive substance becomes (1/16) of the original amount. Then half-ife is 90 min O 30 min 15 min 60 min

Q: The half-life of strontium-90 is 28.0 years. How many grams of this nuclide in a 4.60-g sample will…

A: Half-life time t12=0.696k;   k is decay constantandt=1kln(m0m)m0 is mass of at time t=0m is mass of…

Q: Pls. refer to the given answer choices so that i will know if my solution is wrong

A: 100% undecayed  at time 0 .

Q: 14. Identify the missing coefficient in the following nuclear reaction: 238U* - He + _°r + 234Th C.…

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Q: Barium-142 is an beta emitter with a half-life of 11.0 min. If we start with 2.500 g of 142Ba, what…

A: The number of half-lives (n) can be calculated as

Q: The nuclide 3Cl decays by beta emission with a half-life of 37.2 min. A sample of 0.40 mol of H*Cl…

A: Half life of the reaction is the time of the reaction in which the concentration of the reactant…

Q: Of an initial amount of7000g of​ lead-210, how much will remain in120​years? Lead-210 decays at a…

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Q: Age of the Earth. Suppose that at the formation of the Earth there were equal amounts of 235U and…

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Q: If the half-life of a radioactive element is 30.0 years, how long will it take to decay to the point…

A: For the first order reaction we have the formula as : k*t = ln(A/At) Where A is the initial…

Q: Enter your answer in the provided box. A rock sample originally contains 3.32 mg of 43°U. How much…

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Q: Beginning with 500g, calculate how much of a radioactive compound remains after 152 seconds if the…

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Q: Beginning with 100 g of iron-55, calculate how much remains after 7.7 years.  The half-life of…

A: The time taken during a reaction to reduce the concentration of a reactant to half of its initial…

Q: The radioactive nuclide has a shelf-life of 17.5 hours. What mass remains from 0.0100g sample after…

A: Shelf-life of 17.5 hours, Calculate the mass remains from 0.0100 g after 24 hours.

Q: What percentage of a radioactive sample remains after 3 half-lives? O 25% O 12.5% O 6.25% O 3.125%

A: No of half lives=3 Percentage of radioactive sample=?

Q: A radioactive element decays at such a rate that after 15 minutes, only 1/10 of the original armount…

A: We will iae intergrated rate equations for first order kinetics to solve this question.

Q: Radium-221 has a half life of 30 seconds. How long will it take for 82% of a sample to decay?

A: Half life =30 seconds Decay percentage = 80%

Q: An unknown radioactive element decays into non-radioactive substances.  In 660 days the…

A: Rate constant (k)= 2.303/t log 100/49 So k = (2.303/660) ×0.3098 =0.0011 days ^-1

Q: What is the correct symbol that is missing from the radioactive decay reaction below, and what type…

A: In decay reaction, we have to balance both atomic number and mass number.     We know Helium  is…

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: Radium-226 is radioactive and has a half life of 1600. years. How long would it take a sample to…

A: The emission of energy in the form of the ionizing radiation is called radio decay.This radiation…

Q: Cobalt-60 is a beta-emitter used in radiation cancer treatment equipment in hospitals. What total…

A: Given Initial mass = 24 g half life = 5.33 years time = 16 years

Q: Radium-221 has a half of 30 sec. How long will it take for 82% of a sample to decay?(Round your…

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Q: Formation of Elements Complete the following nuclear reactions and identify the cosmic phase…

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Q: A certain radioactive material is known to decay at a rate proportional to the amount present. If…

A: Consider the given information is as follows; Initial amount N0 = 500 mg Amount after 3 Nt years =…

Q: 44. Cobalt-60 has a half decay, how many grams

A: The answer is given as follows

Q: The half-life of a radioactive element is 8 days. How long will it a 1.0 g sample to decay to 0.0625…

A: Radioactive decay is the process of breakdown of radioactive matter. The atomic nucleus is broken…

Q: A volcanic eruption melts a large area of rock, and all gases are expelled. After cooling, ""Ar…

A: Since the decay reactions are first order reaction. Hence we can say that  1) half life = ln(2) / K…

Q: The half-life of a radioactive element is 6 months. The time taken to reduce its original…

A: Given  Half life of radioactive element ( t1/2 )  = 6 month  Remaining Concentration ( At ) = 116…

Q: How much of a 0.230 g radioactive sample with a half-life of 8 hours would remain after a period of…

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Q: How much of a 15 gram sample of radium-225 would remain after 5 days

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Q: For a radioactive isotope with t1/2 38.7 hr, how many hours will it take for a 3.27 mCi sample to…

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Q: 210Bi → β− + ? 106Ag → 106Cd + ? 68Ge + e → ?

A: Radioactive decay:  It is the process by which radioactive elements which are highly unstable…

Q: If the half-life of a radioactive substance is 4 days how much material will remain after 16 days if…

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Q: What is the half-live of a radioactive isotope if it takes 6.2 days for a 72g sample to decay to…

A: Given, 72 g to decay to 18 g. t = 6.2 days To calculate the half-life.

Q: 14Cdecays by B-emission and after 12.0 h, ninety percent of the radioactive substance remains.…

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Q: A radionuclide undergoes beta decay with half-life of 30.0 years. How many years will it take for 25…

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Q: The half-life of sodium-24 is 15.0 hr. How many grams of this nuclide in a 3.00-g sample will remain…

A: Hello. Since your question has multiple parts, we will solve the first question for you. If you want…

Q: An air sample from a Normal, Illinois basement was found to have a radon activity level of 0.722…

A: Answer:- This question is answered by using the simple concept of radioactive decay which follows…

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: 1. A radioactive sample has decayed until only one-sixteenth ( -) of the parent isotope has…

A: Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a…

Q: The half-life of radon-222 is 3.8 days. How much of a 100 gram sample is left after 15.2 days?

A: Half life is the time taken by the original compound to reduce to it's half.

Q: A radioactive sample has a mass of 500 grams. How much remains after two half-lives?

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Q: Complete the following radioactive decay formulas. (Enter the missing reactant or product. Enter…

A: Complete the following radioactive decay formula ---

Q: A radioactive iodine sample has a half life of 6 days. If the original sample is 24 grams, how much…

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Q: Calculate the percent activity of the radioactive isotope cobalt-60 remaining after three…

A: Here we are required to find the percent activity of radioactive isotope of cobalt 60 remaining…

Q: Calculate the percent activity of the radioactive isotope iodine-131 remaining after two half-lives.…

A: Interpretation -  Calculate the percent activity of radioactive isotope iodine -131 remaining after…

Q: Which type of decay happens when neon-19 decays into fluorine-19? The atomic number of neon is 10;…

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