7.Question 7Lead-lead dating is a great way to figure out the age of something that is close to the age of the solar system. It based on the radioactive decay of uranium.Uranium-238 decays (with intermediate steps) to lead-206 with a half life of 4.5 billion years. Uranium-235 decays to lead-207 with a half life of 0.7 billion years.Which one of the following statements is true?1 pointMeasuring the abundance of uranium-235 shows you how many half-lives have passed since the formation of the rockA higher ratio of lead-204 to lead-206 implies a younger rockThe technique requires finding parts of the meteorite with different abundances of lead and trying to determine how much extra lead exists because of uranium decayObjects which are younger will have more lead-207 than objects which are older.

The amount of time required for the decay of uranium 238 is the same as?1)  The age of the galaxy2)  The age of the universe3)  The age of the Earth

In the process of radiometric dating, if the percent of the original amount of carbon-14 present in a fossil is 12.5%, how old is the fossil? The half-life of carbon-14 is 5,730 years.Multiple choice question.11,460 years old17,190 years old5,700 years old22,920 years old

Which ONE of the following is the best evidence of the reliability of isotopic datingGroup of answer choicesanalyses using two radioactive isotopes yield the same agecomparing isotopic ages with relative age relationshipsmeasurable amounts of parent and daughter atoms are present in rocksmeasurements of decay have been found not to varymost rocks behave as closed systemsthe laws of physics predict that decay rates should be constant

What elements’ isotopes are used to estimate how old something is? Why do scientists use morethan one type? (Be specific, it is not just to get repeated results)3. Pretend you are a scientist and have a tool like the one on Dating Game tab:a. How do you decide which to use: Carbon-14 or Uranium-238?b. How does the percentage help you estimate the age?c. If you can’t get a reading on one object like the fish fossil , what else canyou try? Determine the approximate age of the fish fossil and explain what you did toestimate the fossil age.4. If you were a forensic scientist and found a dead buried body, could you use one of the isotopesin the simulation to figure out how long ago the person died? Explain.5. What type of reaction do Carbon -14 and Uranium- 238 undergo? Explain how you figured thisout and write the reaction for each.

Select the statement that is falseGroup of answer choicesC-14 dating is only appropriate for objects less than 60000 years oldA high activity corresponds to a large decay constantThe half-lives of radioactive nuclides are very similar in magnitudeThe decay constant (k) does not depend on the amount of sample