A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After...
A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 3.80 h, the activity is 8.30 mCi. (a) Find the decay constant and half-life of the isotope. (b) How many atoms of the isotope were contained in the freshly prepared sample? (c) What is the sample's activity 30 h after it is prepared?
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A freshly prepared sample of a certain radioactive isotope has
an activity of 10.0 mCi. After...
A freshly prepared sample of a radioactive isotope has an activity of 27.5 mCi. After 2.60...
A freshly prepared sample of a radioactive isotope has an activity of 27.5 mCi. After 2.60 hours, the activity is 21.0 mCi. (a) Determine the half-life of the isotope. (h) (b) How many nuclei of the isotope were contained in the freshly prepared sample? (nuclei) (c) After how much time will the activity be 1.40 mCi? (h)
Assume that a hypothetical radioactive isotope has a half-life of 15 years. A 100.0-mCi sample of...
Assume that a hypothetical radioactive isotope has a half-life of 15 years. A 100.0-mCi sample of this radioactive isotope is deposited in a lead container. How long it will take until the activity of this sample is reduced to 1.00 mCi?
A radioactive isotope has an activity of 8.95×104 Bq initially. After 3.80 hours the activity is...
A radioactive isotope has an activity of 8.95×104 Bq initially. After 3.80 hours the activity is 5.55×104 Bq. What is the half-life of the isotope? 5.51 h You are correct. Previous Tries What is the activity after an additional 3.80 hours?
A radioactive isotope has an activity of 8.95×104 Bq initially. After 3.80 hours the activity is...
A radioactive isotope has an activity of 8.95×104 Bq initially. After 3.80 hours the activity is 5.64×104 Bq. What is the half-life of the isotope? What is the activity after an additional 3.80 hours?
The initial activity of a sample of the cesium isotope 137Cs is 120 mCi . When...
The initial activity of a sample of the cesium isotope 137Cs is 120 mCi . When delivered to a hospital 13 hours later, its activity is 95 mCi. a.)What is the isotope's half life? th=___________ h b.)If the minimum usable activity is 10mCi, how long after delivery at the hospital is the sample usable? t=__________h
A radioactive isotope has an activity of 8.95×104 Bq initially. After 3.80 hours the activity is...
A radioactive isotope has an activity of 8.95×104 Bq initially. After 3.80 hours the activity is 5.55×104 Bq. What is the half-life of the isotope?
please show all formulas/work 5. The decay constant of a radioactive source is 0.300/minute. - How...
please show all formulas/work 5. The decay constant of a radioactive source is 0.300/minute. - How much time must elapse before the activity is reduced to… (a) 85%? (b) 25%? (c) 5%? B) The half-life of a radioactive source is 14.0 minutes. - How much time must elapse before the activity is reduced by… (a) 70%? (b) 45%? (c) 20%? C) Radon-222 has a physical half-life of 30.0 days. A 10.24 microgram piece of this source is placed in storage....
The activity of a sample of a radioisotope at some time is 10.9 mCi and 0.46...
The activity of a sample of a radioisotope at some time is 10.9 mCi and 0.46 h later it is 7.30 mci. Determine the following. (a) Decay constant (in s-1) S-1 (b) Half-life (inh) (c) Nuclel in the sample when the activity was 10.9 mci nuclei (d) Activity (in mcl) of the sample 3.30 h after the time when it was 10.9 mci mci
If a radioactive isotope has half-life h, then the number of atoms in a sample is...
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
Q13B.12 A sample of a certain radioactive isotope has an activity that we observe to decrease...
Q13B.12 A sample of a certain radioactive isotope has an activity that we observe to decrease by a factor of 47 dur- ing a year. What is the isotope's half-life?
Assume that a hypothetical radioactive isotope has a half-life of 15 years. A 100.0-mCi sample of this radioactive isotope is deposited in a lead container. How long it will take until the activity of this sample is reduced to 1.00 mCi?
The activity of a sample of a radioisotope at some time is 10.9 mCi and 0.46 h later it is 7.30 mci. Determine the following. (a) Decay constant (in s-1) S-1 (b) Half-life (inh) (c) Nuclel in the sample when the activity was 10.9 mci nuclei (d) Activity (in mcl) of the sample 3.30 h after the time when it was 10.9 mci mci
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
Q13B.12 A sample of a certain radioactive isotope has an activity that we observe to decrease by a factor of 47 dur- ing a year. What is the isotope's half-life?
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