A certain radioactive has a half life of 20years. i) Calculate the disintegration constant of the isotope ii) Calculate how long it will take three-quarters of the original atoms to have disintegrated. iii) In a nuclear reactor, what are the particles produced? iv) List at least (5) man made isotopes v) List at least (5) use of man made radioisotopes

Q: 4. Indicate with a plus sign (+) any of these processes that require energy, and a negative sign (-)…

A: Some process, energy is required. For some process, energy is released depending upon the particular…

Q: Iodine that answers the body is stored in the thyroid gland from which is released to control growth…

A: Radioactive decay follows of first order Kinetics.

Q: An animal skeleton has a carbon-14 decay rate of 11.1 disintegrations per minute per gram of carbon.…

A: given: carbon-14 has a half-life = 5730 yrs  carbon-14 decay rate = 11.1 disintegrations carbon-14…

Q: A patient receives 9.0 ng of a radioisotope with a halflife of 12 h. How much will remain in the…

A: Radioactive elements are those which undergoes the spontaneous reactions (may be fusion or fission)…

Q: Complete the table for the radioactive isotope. Half-life Initial Amount After Isotope (years) |…

A:

Q: A 116.8 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

A: Given- Initial amount=116.8ng Final amount=14.60ng Time=47days

Q: The half life of silicon-32 is 710 years. If 60 grams is present now, how much will be present in…

A: The initial amount of silicon-32 is .The initial amount is .The time taken is .To find the final…

Q: View Policies Current Attempt in Progress Strontium-90, a beta emitter, has a half-life of 28.1 yr.…

A:

Q: 21. Barium – 122 has a half-life of 2 minutes. Suppose you obtain a sample weighing 10.0 g and it…

A: 21. Given that: Half life of Barium-122 = 2 mins. Time taken for the set up = 10 mins

Q: If a rock contained 12.0 g of ⁴⁰K when the earth was formed 4.54 billion years ago and the half-life…

A: Given information is as follows; Initial mass of ⁴⁰K in the rock A0 = 12.0 g Final mass of ⁴⁰K in…

Q: You have a sample 100.0 g sample of lodine-135. a) Determine the half-life of a radionuclide if…

A:

Q: Fluorine-18, which has a physical half-life of 110 min, is used in PET scans. if 1.00g of…

A: The fluorine-18 sample was shipped at 5:00 PM and arrives the laboratory at 9:30 AM in the next…

Q: A radioactive isotope has a half-life of 12.0 seconds. How much of a 100 gram sample is left after…

A: Given  Half life of radioactive isotope ( t1/2 )  = 12 second  Initial Mass of sample   ( A )0 = 100…

Q: An artifact is found that has 33% of the 14C it had when it was living. How long ago was this…

A:

Q: A piece of literature has announced that Uranium 238( 23822U) has a binding energy of approximately…

A: We can theoretically calculate the mass of a neutron. But this will be different from the…

Q: For a radioisotope where k=1.5x10-4yr-1, how old is a sample when only 10% remains? 15,000 years…

A: The details solution for this is provided below in attach image.

Q: Complete the following nuclear equations and identify X in each case: b) ?1940→ ?−10+? d)…

A: These are nuclear reactions based on total atomic number and masses on both reactant and product…

Q: 12) Scientists are using Carbon-14 to date a fossil found in some ruins in a crater in southern…

A:

Q: The radioactive isotope 1 Pa decays by beta emission. If the mass of a sample of protactinium-234…

A: The question is based on the concept of nuclear chemistry. we have to calculate the half life of the…

Q: 19) Complete the following nuclear reactions and describe the type of radiation. a) 35.45 Cl + e…

A: Nuclear reaction is the one which a two nucleus or a nucleus  and a subatomic particel collide to…

Q: The half-life of Polonium-218 is 3.00 minutes.  How many half-lives pass after 18.0 minutes ?  The…

A: Concept - Radioactive decays are first order reactions. So we use the formula, Nt = No(1/2)n, where…

Q: The radioactive isotope 125 I has a half-life of 60 days. A sample of this isotope is prepared for a…

A:

Q: 7. Californium-251 was synthesized at the University of California in 1950. At the time of sampling,…

A: Since you have posted a question with multiple sub-parts ,we will solve first three sub-parts for…

Q: Sample of radioactive element with a mass of 200 g, of which 175 g is decayed within 30 days.…

A:

Q: (19] There are 40 grams of radioactive substance at one point in time. After two hours, only 30…

A: The half-life of a quantity is the amount of time it takes to decrease to half of its original…

Q: A 450.0-mg sample of technetium-99m was used for a diagnostic test.  If technetium-99m has an…

A: Given - Initial amount=450.0mg Half life=4.8h Time=48h

Q: Carbon-14 has a half-life of 5730 yr. A living organism has an activity of 15.2 counts per minute…

A:

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: While in the upper peninsula, you have found an unusual fossil in a rock layer that you are really…

A:

Q: a) Strontium-90 has a half-life of 28 years. If a sample was tested in 1980 and found to be emitting…

A: Radioactive decay follows first order kinetics.  k = 0.693/t0.5...(1)  Here,t0.5 = half-life = 28…

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: An unknown radioactive substance is currently decaying. Initially, the sample contained 16.1g of the…

A:

Q: Californium-244 has a half-life of 19.4 minutes. If a researcher has 3.50 mg of Californium-244, how…

A:

Q: The half-life of copper-67 is 61 hours.  If an original sample contains 24 grams how many grams are…

A:

Q: Tc-99m is the most commonly used radioactive isotope in medicine. It is a gamma emitter and has a…

A: The half life of Tc-99 is six hours. There will be two half lives involved in twelve hours. The…

Q: 1. The half-life of Ga-67 is 77.9 hours. How long will it take Ga-67 to decay and lose 95% of its…

A:

Q: alues if needed for this question. grams in 1.80 seconds, what is the half-life of magnesium-20?

A: In this question we want to calculate the half life. Half life is a time where Concentration of…

Q: An element Y was found by meteorologists inside a fossil and at present, there is 3.8g of it left.…

A: Given : initial amount = 30 g                Final amount = 3.8 g             Time taken = 45000…

Q: Complete the following nuclear equations and identify X in each case: a) ?53135→ ??54135+? c)…

A: Nuclear reaction: A nuclear reaction must cause a transformation of at least one nuclide to another.…

Q: Carbon-14 has a half-life of 5730 yr. A living organism has an activity of 15.2 counts per minute…

A:

Q: Carbon-14 has a half-life of 5730 yr. A living organism has an activity of 15.2 counts per minute…

A:

Q: 8. The isotope ¹72Ta undergoes radioactive decay. After 2 hr, 1/16 of the initial amount of 172 Ta…

A:

Q: A) An isotope of uranium-238 decays by alpha emission. The half life of this isotope is 30 years.…

A: Atomic number of uranium = 92 Hence the symbol of uranium-238 = 23892U

Q: In a nuclear reactor, the excess neutrons produced from fission are absorbed by elements, preferably…

A: Those materials can be used to absorb neutrons in a nuclear reactor which will form most stable…