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11. (5 pt) For a 1 mCi sample, what is the activity of 18F in Bq?...
12. A radioactive sample takes 3.5 minutes to reduce its activity from 2.0 10 Bq to...
12. A radioactive sample takes 3.5 minutes to reduce its activity from 2.0 10 Bq to 7.5-10 Bq. Calculate the half life of the sample. [2 marks]
A sample of radioactive material contains 1.1E15 atoms and has an activity of 6.3E11 Bq. What...
A sample of radioactive material contains 1.1E15 atoms and has
an activity of 6.3E11 Bq. What is its half-life?
A sample of radioactive material contains 1.1 x 1015 atoms and has an activity of 6.3 x 1011 Bq. What is its half-life? 1.16E3 X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to...
A sample of radioactive material is initially found to have an activity of 114 Bq. After...
A sample of radioactive material is initially found to have an activity of 114 Bq. After 4 days and 5 hours, the activity of the sample is found to be 85 Bq. 1) Calculate the disintegration constant of this material. 1 = 51 Submit 2) Calculate the half-life of the material. T12- days Submit 3) How long from the beginning (when the activity was 114 Bq) did it take for the sample to reach an activity of 10 Bq? t...
A wooden artifact has a 14C activity of 19.5 disintegrations per minute, compared to 27.5 disintegrations...
A wooden artifact has a 14C activity of 19.5 disintegrations per minute, compared to 27.5 disintegrations per minute for live wood. Given that the half-life of 14C is 5715 years, determine the age of the artifact. ___ x 10 ___ yr A 0.0108−g sample of a radioactive isotope with a half-life of 1.3 ×109 years decays at the rate of 2.7 ×104 disintegrations per minute. Calculate the molar mass of the isotope. ___ x 10 ___ g/mol
What is the activity of the sample in Bq? Cobalt-60, which undergoes beta decay, has a...
What is the activity of the sample in Bq?
Cobalt-60, which undergoes beta decay, has a half- life of 5.26 yr. N = 3.14x1013 B-particles SU Previous Answers All attempts used; correct answer displayed Part B What is the activity of the sample in Bq? t V AC o XD x x x XI .X.10 > . Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining
Q. 86 and 87 i. E) 1.8 x 104 mCi 86) Sodium-24 has a half-life of...
Q. 86 and 87
i. E) 1.8 x 104 mCi 86) Sodium-24 has a half-life of 15 hours. How many hours is three half-lives? A) 60 hours B) 45 hours C) 30 hours D) 15 hours E) 7.5 hours 87) Iodine 131 has a half-life of 8.0 days. An I-131 sample has an initial activity of 32 m What is the activity after 24 days? A) 96 mCi B) 16. mCi C) 8.0 mCi D) 4.0 mCi E) 2.0 mCi
Radioactive Decay - Half-life and Activity 1 Radioactive decay - Half-life Time 0 1000 21 31...
Radioactive Decay - Half-life and Activity 1 Radioactive decay - Half-life Time 0 1000 21 31 750 N 1.000.000 500,000 250,000 125,000 62,500 31.250 15.625 7813 3.506 1.953 977 51 6 500 7 BI . 101 250 125 0 tie 21.234.41516171819, 1012 Time in multiples of A radioactive sample's half-life is 30.2 years. 1 year = 365 days, 1 day = 24 hours, 1 hour - 60 minutes, 1 minute = 60 seconds (a) Find its decay constant in year...
Constants and Conversion Factors 1 Bq - 1 decay/s 1 Ci 3.7 x 101°Bq Avogadro's number...
Constants and Conversion Factors 1 Bq - 1 decay/s 1 Ci 3.7 x 101°Bq Avogadro's number Number of atoms per mole 6.023 x 1023 4) If you have 2 x 1012 atoms of 131Cs, what will the activity be after 50 years? Half life of 137Cs is about 30 years. 6.205E-9 Bq Submit Help Your submissions: 6.205E-9 x Computed value: 6.205E-9Submitted: Sunday, July 8 at 6:49 PM Feedback: 5) How much activity will there be in 137Cs after 50 years...
1. Calculate the activity of a 200.0 g sample of natural potassium. Express your answer both...
1. Calculate the activity of a 200.0 g sample of natural potassium. Express your answer both in Curies (Ci) and in Becquerel (Bq). 1 Bq = 1 nuclei s−1 1 Ci = 3.700×1010 nuclei s−1 2. Technetium-99m is a metastable form of technetium-99 (isotopic mass = 98.9062547 u) and has a half-life of 6.0058 hours. How many grams of Tc-99m are required to have an activity of 50.0 μCi? 3. Ytterbium-169 is a radioactive isotope. 10.0 μg of pure Yb-169...
5. A sample with 4.0x10'15 atoms has an activity of 3.50x 1012 Bq. It has a...
5. A sample with 4.0x10'15 atoms has an activity of 3.50x 1012 Bq. It has a half-life of 600 years. (a) How much is the decay constant? (2 marks) (b) How much time will it take to drop to one-quarter of its original amount? (2 marks)
12. A radioactive sample takes 3.5 minutes to reduce its activity from 2.0 10 Bq to 7.5-10 Bq. Calculate the half life of the sample. [2 marks]
A sample of radioactive material contains 1.1E15 atoms and has
an activity of 6.3E11 Bq. What is its half-life?
A sample of radioactive material contains 1.1 x 1015 atoms and has an activity of 6.3 x 1011 Bq. What is its half-life? 1.16E3 X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to...
A sample of radioactive material is initially found to have an activity of 114 Bq. After 4 days and 5 hours, the activity of the sample is found to be 85 Bq. 1) Calculate the disintegration constant of this material. 1 = 51 Submit 2) Calculate the half-life of the material. T12- days Submit 3) How long from the beginning (when the activity was 114 Bq) did it take for the sample to reach an activity of 10 Bq? t...
What is the activity of the sample in Bq?
Cobalt-60, which undergoes beta decay, has a half- life of 5.26 yr. N = 3.14x1013 B-particles SU Previous Answers All attempts used; correct answer displayed Part B What is the activity of the sample in Bq? t V AC o XD x x x XI .X.10 > . Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining
Q. 86 and 87
i. E) 1.8 x 104 mCi 86) Sodium-24 has a half-life of 15 hours. How many hours is three half-lives? A) 60 hours B) 45 hours C) 30 hours D) 15 hours E) 7.5 hours 87) Iodine 131 has a half-life of 8.0 days. An I-131 sample has an initial activity of 32 m What is the activity after 24 days? A) 96 mCi B) 16. mCi C) 8.0 mCi D) 4.0 mCi E) 2.0 mCi
Radioactive Decay - Half-life and Activity 1 Radioactive decay - Half-life Time 0 1000 21 31 750 N 1.000.000 500,000 250,000 125,000 62,500 31.250 15.625 7813 3.506 1.953 977 51 6 500 7 BI . 101 250 125 0 tie 21.234.41516171819, 1012 Time in multiples of A radioactive sample's half-life is 30.2 years. 1 year = 365 days, 1 day = 24 hours, 1 hour - 60 minutes, 1 minute = 60 seconds (a) Find its decay constant in year...
Constants and Conversion Factors 1 Bq - 1 decay/s 1 Ci 3.7 x 101°Bq Avogadro's number Number of atoms per mole 6.023 x 1023 4) If you have 2 x 1012 atoms of 131Cs, what will the activity be after 50 years? Half life of 137Cs is about 30 years. 6.205E-9 Bq Submit Help Your submissions: 6.205E-9 x Computed value: 6.205E-9Submitted: Sunday, July 8 at 6:49 PM Feedback: 5) How much activity will there be in 137Cs after 50 years...
5. A sample with 4.0x10'15 atoms has an activity of 3.50x 1012 Bq. It has a half-life of 600 years. (a) How much is the decay constant? (2 marks) (b) How much time will it take to drop to one-quarter of its original amount? (2 marks)
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