The Strontium-90 isotope has a half-life of 28.1 years. Supposed we used a .10 Curie sample...
The Strontium-90 isotope has a half-life of 28.1 years. Supposed we used a .10 Curie sample of Sr-90. That is, we used enough Sr-90 to have an activity of .10 Ci (1 Ci=3.7x1010 disintegrations/second)
Calculate the activity of this sample when used by students 281 years from now.
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The Strontium-90 isotope has a half-life of 28.1 years. Supposed
we used a .10 Curie sample...
Strontium-90 has a half-life of 28.1 years. Starting with 3.2 mg of this isotope, how much...
Strontium-90 has a half-life of 28.1 years. Starting with 3.2 mg of this isotope, how much would remain after 112.4 years?
The half-life of strontium-90 is 28.1 years. How long will it take a 10.0-g sample of...
The half-life of strontium-90 is 28.1 years. How long will it take a 10.0-g sample of strontium-90 to decompose to 0.69 g? a) 217 years b) 108 years c) 163 years d) 73 years
Sr-90 has a half-life of 29.1 years. How long will it take for the activity of...
Sr-90 has a half-life of 29.1 years. How long will it take for the activity of a Sr-90 sample to decay from 5.3 times 10^3 dpm (disintegrations per minute) to 3 times 10^2 dpm? The half-life of a radioisotope is 3 d. What percent remains after 1 week?
Question 19 Correct Mark 1.00 out of 1.00 By mass spectral analysis, a sample of strontium...
Question 19 Correct Mark 1.00 out of 1.00 By mass spectral analysis, a sample of strontium is known to contain 2.64x1010 atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life (in years) of Sr-90. P Flag question Answer: 28.1 Question 20 Incorrect How long will it take (in years) for the disintegration rate of this sample to drop to 757 disintegrations per minute? Mark...
A 0.0116-g sample of a radioactive isotope with a half life of 1.3x109 years decays at...
A 0.0116-g sample of a radioactive isotope with a half life of 1.3x109 years decays at the rate of 2.9x104 disintegrations per minute. Calculate the molar mass of the isotope. Enter your answer in scientific notation. (g/mol)
Sr-90 is a radioactive isotope that is a major product of an atomic bomb explosion. It...
Sr-90 is a radioactive isotope that is a major product of an atomic bomb explosion. It is not found naturally in nature. It has a half-life of 28.1 years. Determine k for the first order radioactive decay. Calculate the fraction of Sr-90 that remains after 10 half-lives. Calculate the time required for 89.3% of Sr-90 to disappear. Sr-90 is linked to bone cancer in persons who have lived near a nuclear event. Why? A sample of bone tissue was unearthed...
Yttrium 90, which has a half-life of 64.2 h, is produced from the fission product strontium...
Yttrium 90, which has a half-life of 64.2 h, is produced from the fission product strontium 90 which has a half-life of 27.5 years. How much Y-90 will be present after I week from a sample of pure Sr-90 in a closed container? Ans.: 0.00027
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137...
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
change the answer 10. (0/5 points) DETAILS PREVIOUS ANSWERS The half-life of isotope 228 Th is...
change the answer 10. (0/5 points) DETAILS PREVIOUS ANSWERS The half-life of isotope 228 Th is 1.913 years. Calculate the activity of 7e-069 of this isotope in B and C: 90 A= 362 XBq and A ci. Find the activity of this sample after 8 years: C. Submit Answer View Previous Question Question 10 of 11 View Next Question Home My Assignments Request Extension
The half-life of iodine-131 ( 131 I ) , an isotope used in the treatment of...
The half-life of iodine-131 ( 131 I ) , an isotope used in the treatment of thyroid disorders, is 8.04 days. If a sample of iodine-131 contains 4.10 × 10 16 nuclei, what is the activity of the sample? Express your answer in curies. Ci
Strontium-90 has a half-life of 28.1 years. Starting with 3.2 mg of this isotope, how much would remain after 112.4 years?
Sr-90 has a half-life of 29.1 years. How long will it take for the activity of a Sr-90 sample to decay from 5.3 times 10^3 dpm (disintegrations per minute) to 3 times 10^2 dpm? The half-life of a radioisotope is 3 d. What percent remains after 1 week?
Question 19 Correct Mark 1.00 out of 1.00 By mass spectral analysis, a sample of strontium is known to contain 2.64x1010 atoms of Sr-90 as the only radioactive element. The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life (in years) of Sr-90. P Flag question Answer: 28.1 Question 20 Incorrect How long will it take (in years) for the disintegration rate of this sample to drop to 757 disintegrations per minute? Mark...
Yttrium 90, which has a half-life of 64.2 h, is produced from the fission product strontium 90 which has a half-life of 27.5 years. How much Y-90 will be present after I week from a sample of pure Sr-90 in a closed container? Ans.: 0.00027
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
change the answer 10. (0/5 points) DETAILS PREVIOUS ANSWERS The half-life of isotope 228 Th is 1.913 years. Calculate the activity of 7e-069 of this isotope in B and C: 90 A= 362 XBq and A ci. Find the activity of this sample after 8 years: C. Submit Answer View Previous Question Question 10 of 11 View Next Question Home My Assignments Request Extension
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