Assume that when the earth was created there was the same amount of 235 U and...
Assume that when the earth was created there was the same amount of 235 U and 238 U; the present ratio of 235 U to 238 U is 0.7%. The half life of 235 U is 8.8x10^8 yr. and for 238 U is 4.5 x 10^9 yr. What is the age of the Earth?
Homework Answers
Add Answer to:
Assume that when the earth was created there was the same amount
of 235 U and...
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?
Problem 2(10 points): The natural composition of uranium and the half-life of the isotopes are gi...
Problem 2(10 points): The natural composition of uranium and the half-life of the isotopes are given below in the table. Isotope |At90 Half-life (vrs) U-234 0.005% 2.455 x 10 0.711% 17.038 x 108 U-23899.284% 4.468 x 109 U-235 Assume earth was formed 4.54 x 109 years ago. The ratio of U-235 to U-238 has been steadily decreasing since than. (a) Calculate the enrichment of U-235 (in atom percent) at the time of formation of the earth (t=0) (b) Calculate the...
1) When Uranium-235 (atomic number 92/mass number 235) is struck by a slow neutron it is...
1) When Uranium-235 (atomic number 92/mass number 235) is struck by a slow neutron it is split into two smaller elements and 3 neutrons (atomic number 0/mass number 1). If one of the elements it splits into is Strontium (Sr) (atomic number 38/mass number 90), what is the other element it splits into? Must include atomic number and mass number. 2) Uranium-238 eventually decays into Lead-206. The half-life of Uranium-238 is 4.5 x 109 or 4.5 billion years. A rock...
If a sample of U−238 initially contained 1.1×1018 atoms when the universe was formed 13.8 billion...
If a sample of U−238 initially contained 1.1×1018
atoms when the universe was formed 13.8 billion years ago, how many
U−238 atoms will it contain today?
How long will it take for 10% of the U-238 atoms in a sample of U-238 to decay? Express your answer using two significant figures Constants| Periodic Table The half-life for the radioactive decay of U - 238 is 4.5 billion years and is independent of initial concentration. t- 6.8x108 yr All attempts used;...
A problem relating to Nucleosynthesis (a) Current scientific understanding is that Uranium is created in supernova...
A problem relating to Nucleosynthesis
(a) Current scientific understanding is that Uranium is created in supernova explosions, with an initial U-235/U-238 ratio of 1.65 (that is, 1.65 U-235 atoms for every one U-238 atom). Determine the amount of time that has passed since the supernova event that formed Earth's uranium.* (10 pts) (b) From the luminosity of the Sun and the energy generated per Helium-4 nucleus created, determine the amount of Helium created per second, in kg, in the Sun's...
Q24,25 xplou how naturally occurring ratct towp inside Earth produce geothermal Ex energy 23. Uranium-235 has a much...
Q24,25
xplou how naturally occurring ratct towp inside Earth produce geothermal Ex energy 23. Uranium-235 has a much shorter half-life than uranium-238. These two isotopes occurred in equal abundance when Earth was formed. Compare their relative abundance today 4. A radioactive tracer used in a medical test has a half-life of, 2.4 h. What fraction of this tracer will remain after 12 h? 25. An archaeologist finds a wooden arrow shaft vith a proportion of carbon-14 that is about 25...
EARTH SCHENCE RESOURCE MANUAL 7. A Crystored ova ow conta con crys. Amos como os used...
EARTH SCHENCE RESOURCE MANUAL 7. A Crystored ova ow conta con crys. Amos como os used to count the percentage of otoms of Uranium-235 ond Leod 207 bolopes in con omstrom the love how the analyse d that percent of the glome were Uranium 235 and 2 percent of the stoms were los 2017 About how many hoes of the monum.235 L 207 deco pohoveloped in the conce what the absolute age of the love tow boned on this contra...
Archaeologists can determine the age of artifacts made of wood or bone by measuring the amount...
Archaeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14C present in the object. The amount of isotope decreases in a first-order process. If 14.1% of the original amount of 14C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of 14C is 5,730 yr. Give your answer in scientific notation. x 10yr
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?
Be sure to answer all parts. Archaeologists can determine the age of artifacts made of wood...
Be sure to answer all parts. Archaeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 1"C present in the object. The amount of isotope decreases in a first-order process. If 12.0% of the original amount of 1"C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of 14C is 5,730 yr. Give your answer in scientific notation. x...
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?
Problem 2(10 points): The natural composition of uranium and the half-life of the isotopes are given below in the table. Isotope |At90 Half-life (vrs) U-234 0.005% 2.455 x 10 0.711% 17.038 x 108 U-23899.284% 4.468 x 109 U-235 Assume earth was formed 4.54 x 109 years ago. The ratio of U-235 to U-238 has been steadily decreasing since than. (a) Calculate the enrichment of U-235 (in atom percent) at the time of formation of the earth (t=0) (b) Calculate the...
If a sample of U−238 initially contained 1.1×1018
atoms when the universe was formed 13.8 billion years ago, how many
U−238 atoms will it contain today?
How long will it take for 10% of the U-238 atoms in a sample of U-238 to decay? Express your answer using two significant figures Constants| Periodic Table The half-life for the radioactive decay of U - 238 is 4.5 billion years and is independent of initial concentration. t- 6.8x108 yr All attempts used;...
A problem relating to Nucleosynthesis
(a) Current scientific understanding is that Uranium is created in supernova explosions, with an initial U-235/U-238 ratio of 1.65 (that is, 1.65 U-235 atoms for every one U-238 atom). Determine the amount of time that has passed since the supernova event that formed Earth's uranium.* (10 pts) (b) From the luminosity of the Sun and the energy generated per Helium-4 nucleus created, determine the amount of Helium created per second, in kg, in the Sun's...
Q24,25
xplou how naturally occurring ratct towp inside Earth produce geothermal Ex energy 23. Uranium-235 has a much shorter half-life than uranium-238. These two isotopes occurred in equal abundance when Earth was formed. Compare their relative abundance today 4. A radioactive tracer used in a medical test has a half-life of, 2.4 h. What fraction of this tracer will remain after 12 h? 25. An archaeologist finds a wooden arrow shaft vith a proportion of carbon-14 that is about 25...
EARTH SCHENCE RESOURCE MANUAL 7. A Crystored ova ow conta con crys. Amos como os used to count the percentage of otoms of Uranium-235 ond Leod 207 bolopes in con omstrom the love how the analyse d that percent of the glome were Uranium 235 and 2 percent of the stoms were los 2017 About how many hoes of the monum.235 L 207 deco pohoveloped in the conce what the absolute age of the love tow boned on this contra...
Archaeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14C present in the object. The amount of isotope decreases in a first-order process. If 14.1% of the original amount of 14C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of 14C is 5,730 yr. Give your answer in scientific notation. x 10yr
Be sure to answer all parts. Archaeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 1"C present in the object. The amount of isotope decreases in a first-order process. If 12.0% of the original amount of 1"C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of 14C is 5,730 yr. Give your answer in scientific notation. x...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 11 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 11 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 11 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 11 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 11 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 11 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 11 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 11 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 11 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 11 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 11 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 11 months ago