The isotope 137N has a half-life of 9.96 min. Determine the time interval (in min) required for the activity of a sample of this isotope to decrease to 41.0% of its original value.
The isotope 137N has a half-life of 9.96 min. Determine the time interval (in min) required...
The half-lives of different radioisotopes are given in the table. Half-life (min) Radioisotope argon-44 12 lead-196 37 22 potassium 44 indium-117 43 If the initial amount of potassium-44 is 8.8 g, how much potassium-44 is left in the body after 44 min? mass: g TOOLS x10 What is the half-life of an isotope that decays to 12.5% of its original activity in 70.6 h? half-life: h The half-lives of different radioisotopes are given in the table. Half-life (min) 12 Radioisotope...
1. The half-life of an isotope of phosphorus is 14.2 days. If a sample contains 3.96e16 such nuclei, determine its activity.? 2. A 234-mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample has a half-life of 17.4 days, how long will it keep before its activity is reduced to 28.9 mCi?
What is the half‑life of an isotope that decays to 25% of its original activity in 33.7 h? What is the half‑life of an isotope that decays to 12.5% of its original activity in 10.2 h?
Radium-226. a radium isotope, has a half-life (the time it takes half of the isotope to decay) of about 1620 years. A sample of radium-226 has a mass of 30 grams. Which of the following equations expresses the number of grams, g, of this sample that will be left after tyears? OA 1620 9= 30 -15.00 OB oc 9 = 30 - 157620 OD 9=301620
A) 13N decays with a half-life of approximately 10 min to produce 13C, a stable isotope of carbon. For a 1.0g sample of 13N, after one half-life, what mass of 13N remains? What has happened to the remaining mass? B) 223Ra decays by alpha emission with a half-life of 11.43 days. For a 1.0g sample of 223Ra, after one half-life, what mass of 223Ra remains? What has happened to the remaining mass?
The isotope 208^Tl undergoes β decay with a half-life of 3.1 min. (a) What isotope is produced by the decay? (b) How long will it take for 99.0% of a sample of pure 208Tl to decay? (c) What percentage of a sample of pure 208Tl remains un-decayed after 1.0 h?
The radioactive isotope, Fr - 223, has a half-life of 22 minutes. How many minutes will it take for an original sample to decay to 12.5% of its original amount? Express your answer in minutes. Enter only the numeric value of the answer without the units.
The half-life of a radioactive isotope is 2.5 min. If there are initially 48 Times 10^32 atoms of this isotope, (a) the number of atoms of this isotope remaining after 15 min is: 12 Times 10^32 7.5 Times 10^31 3 Times 10^32 6 Times 10^4 3 Times 10^2 (b) what is the decay constant? (c) What is the initial activity?
What is the half‑life of an isotope that decays to 6.25% of its original activity in 70.6 h?
what is the half life of an isotope that decays to 12.5% of its original activity in 33.6 hours