A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life?

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: The half life of an isotope is 43 seconds.  How long does it take 100.00 g of that isotope to decay…

A: Given that  Initially weight of isotope sample = 100.0 gm initially number of atoms of isotope No=…

Q: The half-life of Lithium-8 (Li-8) is 0.84 seconds. If 400 grams of Li-8 were released to the…

A:

Q: Beginning with 1.00 g of a sample of an unknown radioactive isotope, 0.05674 g of the isotope will…

A: The answer to the following question is-

Q: The number of radioactive nuclides in a sample decays from 3.80 x to 1020 19 9.50 x 10 in 58.0…

A:

Q: A pure sample of tritium, 3H, was prepared and sealed in a container for a number of years. Tritium…

A:

Q: A substance has a half-life of 2.045 minutes. If the  initial amount of the substance was 132.8…

A: Given,  Half-life, t1/2  = 2.045 minutes Initial ammount, A0 = 132.8 gram

Q: If uranium-238 has a half-life of 45 billion years, how many years would it take for a 10-gram…

A: Given  Half life of U-238 (t1/2)   = 45 billion years 1 billion years    = 109 years  45 billion…

Q: After 20 years, only 3.125% of the initial amount of radioactive isotope is left. What is the…

A:

Q: Strontium-90 is radioactive and has a half life of 28.8 years. What percentage of a sample would be…

A:

Q: Uranium-235 decays to Lead-207 with a half life of about 704 million. years. if you find a 1000g…

A: Half life of Uranium-235t12 = 704 million years Initial amount of fossilNo= 1000 gms Final amount of…

Q: 187 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Given datas –  t1/2 = 30.2 years  t = ?  [A0] = 100.0 g  [At] = 1.20 g

Q: A radioactive isotope has a half-life of 11 minutes.  How many grams of a 18.68 g sample remain…

A: Given Half life = 11minutes = 11*60= 660 second Sample weight = 18.68g Time = 44 minutes = 44*60=…

Q: The half life of an isotope is 43 seconds.how long does it take 100.00 g of isotope to decay to 6.25…

A: Given data contains, Half-life of an isotope is 43 seconds. Mass of isotope before decay is 100.0 g.…

Q: A radioactive sample contains 9.5 x 1017 atoms of a nuclide that decays at a rate of 5.4 x 1013…

A:

Q: What is the half life of a radioactive sample , if 3/4 of its nuclei decay in 2 years ?

A: Given:The amount of nuclear decay in 2 years = ¾ th of initial massAssume that the initial mass =…

Q: After 60 days, 10 grams of radioactive isotope remains from an original 27 g sample. What is the…

A: Given,

Q: Ca-60 is used extensively in radiotherapy and its half-life is 5.27 years. How many years will it…

A: Given: half life, t12=5.27 years[A]=0.2[A]o To calculate: Years taken to decrease to 20% of its…

Q: 2) If 20.0 g of a radioactive isotope are present at 1:00 PM and 5.0 g remain at 2:00 PM, what is…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: After 119 days have elapsed, 1/12 of a radioisotope sample remains undecayed. What is the half-life…

A: Amount of radioisotopes remaining = 112 of the initial amount Number of days taken for the decay =…

Q: The half life of an isotope is 43 seconds. How long does it take 100.0g of that isotope to decay to…

A: Half life = 43 second k = 0.693half life= 0.69343 sec=0.016 s-1

Q: 7. If uranium-238 has a half-life of 45 billion years, how many years would it take for a 10-gram…

A: The half-life is the time required to reduce one half of the initial concentration of the substance.

Q: Radium-223 has a half-life of 11.43 days. How long will it take for 80% of a sample of the said…

A:

Q: A radioactive substance has a ​half-life of 437 years. What is its decay​ rate?

A: Radioactive Decay: Radioactive decay is the property of the several naturally occurring elements as…

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: A certain radioisotope has a half-life of 6.58 days. What percentage of an initial sample of this…

A:

Q: The number of a certain radioactive nuclide present in a sample decays from 59,122 to 429 in 9.23…

A: Given: No=59122Nt=429t=9.23 days Half life of the radioactive species refers to the time required to…

Q: At a certain instant, 100 grams of radioactive substance is present. After 20 years, 99.76 grams…

A: The half-life is the time required to change the initial amount to half of the amount. It is denoted…

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: 187 Cs 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 half-life of radium 226 is 1602 years. If you have 500 grams of radium today how many grams…

A: This is a first order reaction where the radioactive substance disintegrates. The half life time of…

Q: After 60 days, 10 grams of radioactive isotope remains from an original 80 g sample. What is the…

A: Law of radioactive decay: Law of radioactive decay relates the amount radioactive substance…

Q: The half-life of a radioactive nucleus is 1.5·10 -8 s. What is this half-life in milliseconds (ms),…

A: The half-life of the given radioactive nucleus is 1.5×10-8 s. This half-life can be converted into…

Q: After 19 days have elapsed, 1/21 of a radioisotope sample remains undecayed. What is the half-life…

A:

Q: 187 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A: Half life means time takwen by the sample to reachhalf of its concentartion.  Remains afetr t time =…

Q: The radioactive substance neptunium -139 decays to 72.85% of its original amount after 28 hours. How…

A: For radioactive decay, relation between rate constant and its concentration is give below.…

Q: A radioactive isotope has a half life of 60.2 minutes.How long will it take for radiation from a 325…

A: The radioactive decay of an isotope follows a first-order reaction, The integrated rate law for a…

Q: If 20% of the radioactive substance disappears in one year, find its half-life assuming exponential…

A:

Q: what is the half life of an isotope that decays to 25% of its original activity in 68.9 hours?

A: For a first order reaction, rate constant can be calculated as

Q: The radioactive nuclide Plutonium-199 has a half-life of 43.0 min. A sample is prepared that has an…

A: Half-life of radioactive substance: T1/2 = 43.0 min Initial activity of radioactive substance: AO =…

Q: If you have 2.00 grams of a radioisotope, with a half-life of 5 days, how much of the isotope is…

A: Given;

Q: The half-life of a given radioactive substance is 2.5 minutes. What fraction of the original…

A: Given, half-life , t1/2 = 2.5 min                     and, t = 10 min We need to calculate the…

Q: Given the half-life of Carbon-14 is 5770 years, how much of a 540 gram sample is left after 10000…

A: For the given radioactive decay process: Rate constant, k =?  Half-life=5770 years According to…

Q: After 60 days, 10 grams of radioactive isotope remains from an original 38 g sample. What is the…

A:

Q: A radioactive isotope has a half-life of 60.2 days. What fraction of the isotope remains after 418…

A: Provided half life(t1/2) = 60.2 days Provided time(t)=418 days Let initial amount= [A•] Let final…

Q: A certain radioisotope has a half-life of 9.54 days. What percentage of an initial sample of this…

A:

Q: Iron-59 has a physical half-life of 45 days. If 96 g of a radioactive iron sample (59Fe) is received…

A:

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

A:

Q: what is it's half-life?

A: