A sample of 1.63 x 107 nuclei with a decay constant of 1.4 × 10-5 is...
A sample of 1.63 x 107 nuclei with a decay constant of 1.4 × 10-5 is left for two days.
A.) How many are left?
B.) what was the initial activity in decays/second? 1 decay/second is a becquerel (Bq).
Homework Answers
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A sample of 1.63 x 107 nuclei with a decay constant of 1.4 ×
10-5 is...
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...
The decay curve of a radioactive nuclide sample is shown. Its initial activity is measured to...
The
decay curve of a radioactive nuclide sample is shown. Its initial
activity is measured to be X Bq.
14. What is the population at t=8.0
15. After how many half lives will the population be 125
nuclides?
16. What will be the level of activity (in terms of X) after
two half lives have elapsed?
17. What would the activity of the above sample be if we
tripled its size?
18. If the initial activity of 0.356 grams of...
11. (5 pt) For a 1 mCi sample, what is the activity of 18F in Bq?...
11. (5 pt) For a 1 mCi sample, what is the activity of 18F in Bq? 18F decays by positron emission with a half-life of 109 minutes. a. 3.7 x 104 Bq b. 3.7 x 107 Bq c. 3.7 x 1010 Bq d. 2.7 x 10-3 Bq e. 2.7 x 10-11 Bq
5 of 5 A certain substance has a half-life of 5.0 hours. How many nuclei of...
5 of 5 A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 7.0 Cl? (1 Ci = 3.7 * 1010 Bq) 2.4 x 10 nuclei 8.5 x 10 nuclei 3.2 x 10 nuclei 6.7 x 10 nudel AR EN 246 PM Type here to search ар)
(b) [5 marks] Using first principles, derive the radioactive decay rate for nuclei whose decay constant...
(b) [5 marks] Using first principles, derive the radioactive decay rate for nuclei whose decay constant is ?. Here R,-??, is the rate of decay at t-0 [5 marks] A count-rate meter is used to measure the activity of a given sample. At one instance it shows 4750 counts per minute (cpm). Five minutes later it shows 2700 cpm. Find the decay constant and the half-life of the sample. (c) (d) [5 Marks] For alpha decay, show that 13 markel...
Phas half life of 1.23 x 10 second. [Ans: 1.41x1017nuclei, 7.9x 1010 decay/s, 1.2x1016nuclei] If we...
Phas half life of 1.23 x 10 second. [Ans: 1.41x1017nuclei, 7.9x 1010 decay/s, 1.2x1016nuclei] If we have 7.5 ug sample P-32 initially, how many nuclei are present? a) What is its activity initially? b) How many nuclei are present 2500 min later? c)
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 half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. s (b) Calculate...
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. s (b) Calculate the decay constant for this isotope. s−1 (c) Convert 0.650 μCi to the SI unit the becquerel. Bq (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.650 μCi. 131I nuclei (e) Suppose the activity of a certain 131I sample is 7.10 mCi at a given time. Find the number of half-lives the sample goes through in...
please help with parts in case 1 and case 2! thanks you! Correct (100,0%) submit Find...
please help with parts in case 1 and case 2! thanks you!
Correct (100,0%) submit Find its decay constant in write the result in terms of 10 Keep 4 decimal places. 1.2327 Correct (100.046) Submit x10-7-1 Case 1: The mass of the initial radioactive sample is 6.20 kg. Some time after the initial sample was prepared, it was found that 0.447 kg radioactive materials has decayed. (h) What is the mass in kg) of the radioactive material that remains in...
Suppose you start with a sample with 2.900×108 nuclei of a particular isotope. This isotope has...
Suppose you start with a sample with 2.900×108 nuclei of a particular isotope. This isotope has a half-life of 374 s. a) What is the decay constant for this particular isotope? b) How many nuclei remain after 797 s? c) What is the activity of the sample at the beginning of the experiment?
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...
The
decay curve of a radioactive nuclide sample is shown. Its initial
activity is measured to be X Bq.
14. What is the population at t=8.0
15. After how many half lives will the population be 125
nuclides?
16. What will be the level of activity (in terms of X) after
two half lives have elapsed?
17. What would the activity of the above sample be if we
tripled its size?
18. If the initial activity of 0.356 grams of...
11. (5 pt) For a 1 mCi sample, what is the activity of 18F in Bq? 18F decays by positron emission with a half-life of 109 minutes. a. 3.7 x 104 Bq b. 3.7 x 107 Bq c. 3.7 x 1010 Bq d. 2.7 x 10-3 Bq e. 2.7 x 10-11 Bq
5 of 5 A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 7.0 Cl? (1 Ci = 3.7 * 1010 Bq) 2.4 x 10 nuclei 8.5 x 10 nuclei 3.2 x 10 nuclei 6.7 x 10 nudel AR EN 246 PM Type here to search ар)
(b) [5 marks] Using first principles, derive the radioactive decay rate for nuclei whose decay constant is ?. Here R,-??, is the rate of decay at t-0 [5 marks] A count-rate meter is used to measure the activity of a given sample. At one instance it shows 4750 counts per minute (cpm). Five minutes later it shows 2700 cpm. Find the decay constant and the half-life of the sample. (c) (d) [5 Marks] For alpha decay, show that 13 markel...
Phas half life of 1.23 x 10 second. [Ans: 1.41x1017nuclei, 7.9x 1010 decay/s, 1.2x1016nuclei] If we have 7.5 ug sample P-32 initially, how many nuclei are present? a) What is its activity initially? b) How many nuclei are present 2500 min later? c)
please help with parts in case 1 and case 2! thanks you!
Correct (100,0%) submit Find its decay constant in write the result in terms of 10 Keep 4 decimal places. 1.2327 Correct (100.046) Submit x10-7-1 Case 1: The mass of the initial radioactive sample is 6.20 kg. Some time after the initial sample was prepared, it was found that 0.447 kg radioactive materials has decayed. (h) What is the mass in kg) of the radioactive material that remains in...
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