The half-life of U-238 is 4.47x109 years. What is the activity after 10 million years, if...
The half-life of U-238 is 4.47x109 years.
What is the activity after 10 million years, if the amount initially present is 50,000 Bq? What implications does this have on the disposal of such material?
Homework Answers
We can clearly see that for elements like U-238, it takes very long time to decay(Millions of years).
Add Answer to:
The half-life of U-238 is 4.47x109 years.
What is the activity after 10 million
years, if...
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. If a sample of U−238 initially contained 1.2×1018 atoms and was formed 6.3 billion years ago, how many U−238 atoms does it contain today? Express your answer using two significant figures.
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. 1.How long will it take for 10% of the U−238 atoms in a sample of U−238 to decay? 2.If a sample of U−238 initially contained 1.9×1018 atoms when the universe was formed 13.8 billion years ago, how many U−238 atoms will it contain today?
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. a) How long will it take for 17 % of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures and in yrs b) If a sample of U−238 initially contained 1.8×1018 atoms and was formed 4.9 billion years ago, how many U−238 atoms does it contain today? Express your answer using two significant figures.
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 14 % of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures. Part B If a sample of U−238 initially contained 1.4×1018 atoms and was formed 5.7 billion years ago, how many U−238 atoms does it contain today? Express your answer using two significant figures.
half life U-235 is 7.04x10^8 years half life U-238 is 4.468 x10^9 years 3. One may assume that when U-238 was formed...
half life U-235 is 7.04x10^8 years
half life U-238 is 4.468 x10^9 years
3. One may assume that when U-238 was formed at the genesis of Earth, an equal amount of 235U was formed. Today the amount of 238U is 138 times the amount of 235U. How long a time ago did the genesis occur according to this assumption?
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...
The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 20% of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures. Part B If a sample of U−238 initially contained 1.5×1018 atoms when the universe was formed 13.8 billion years ago, how many U−238 atoms will it contain today? Express your answer using two significant figures.
Course Contents HOMEWORKS 10 (due... Half life and activity of a radioactive ... - Timer Notes...
Course Contents HOMEWORKS 10 (due... Half life and activity of a radioactive ... - Timer Notes Evaluate Feedback A radioactive isotope has an activity of 8.86x109 Bq initially. After 3.65 hours the activity is 5.94x109 Bq. What is the half-life of the Isotope? Suomt Answer Tries 0/20
(d) Due to alpha decay, l mole of uranium-238 produces 2.96 106 alpha particles per second. Find the half-life, giving...
(d) Due to alpha decay, l mole of uranium-238 produces 2.96 106 alpha particles per second. Find the half-life, giving your answer in units of years. [5 marks] (e) The average mass of the atoms in a 0.100 kg block of pure carbon is 12.01 u. A small fraction of the atoms are radioactive, with a decay constant of 3.90 x 10-12s. If the activity of the carbon block is 97.8 Bq, calculate what fraction of the atoms are radioactive...
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...
11. Radiometric dating a. If 226Ra has a half-life of 1600 years, what is its decay...
11. Radiometric dating a. If 226Ra has a half-life of 1600 years, what is its decay constant in units of s1? Knowing that radium occurs naturally at about 1.2 pCi/L, how many radioactive nuclei would be present in a 12.5 kL swimming pool? b. c. What then would be its initial activity in Bq? If the 12.5 kL of water was from an ancient ceremonial pool in Egypt for the private use of King Tut, after 3500 years what would...
half life U-235 is 7.04x10^8 years
half life U-238 is 4.468 x10^9 years
3. One may assume that when U-238 was formed at the genesis of Earth, an equal amount of 235U was formed. Today the amount of 238U is 138 times the amount of 235U. How long a time ago did the genesis occur according to this assumption?
Course Contents HOMEWORKS 10 (due... Half life and activity of a radioactive ... - Timer Notes Evaluate Feedback A radioactive isotope has an activity of 8.86x109 Bq initially. After 3.65 hours the activity is 5.94x109 Bq. What is the half-life of the Isotope? Suomt Answer Tries 0/20
(d) Due to alpha decay, l mole of uranium-238 produces 2.96 106 alpha particles per second. Find the half-life, giving your answer in units of years. [5 marks] (e) The average mass of the atoms in a 0.100 kg block of pure carbon is 12.01 u. A small fraction of the atoms are radioactive, with a decay constant of 3.90 x 10-12s. If the activity of the carbon block is 97.8 Bq, calculate what fraction of the atoms are radioactive...
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...
11. Radiometric dating a. If 226Ra has a half-life of 1600 years, what is its decay constant in units of s1? Knowing that radium occurs naturally at about 1.2 pCi/L, how many radioactive nuclei would be present in a 12.5 kL swimming pool? b. c. What then would be its initial activity in Bq? If the 12.5 kL of water was from an ancient ceremonial pool in Egypt for the private use of King Tut, after 3500 years what would...
Most questions answered within 3 hours.
-
Michaella, age 23, is a full-time law student and is claimed by
her parents as a...
asked 33 seconds ago -
Why are polymers not typically casted into products?
asked 17 minutes ago -
When rolling a die 129 times, what is the probability of rolling
a 6 no more...
asked 34 minutes ago -
4. A call option currently sells for $7.75. It has a strike
price of $85 and...
asked 22 minutes ago -
1.
You need to prepare 10.0 liters of an acid aqueous solution with a
pH of...
asked 25 minutes ago -
Along an aggregate supply curve, if the level of output is less
than the natural level...
asked 26 minutes ago -
By 2025, annual consumption in emerging markets will total $30
trillion and contribute more than ________...
asked 31 minutes ago -
At what point does reformation cease to be a viable option for
those who are oppressed...
asked 35 minutes ago -
Place letters corresponding to amounts in the proper order for
lightest to heaviest samples:
a) 2100...
asked 39 minutes ago -
Consider the multicore processor with 6 heterogeneous cores
labelled C1, C2, C3, C4, C5, and C6....
asked 42 minutes ago -
Document system components according to standards and procedures
(Implement and hand over system components) IT administrative
asked 42 minutes ago -
The college asked 700 students if they wanted a longer spring
break and 600 students said...
asked 42 minutes ago