15 questions

- 1. Multiple ChoiceScientists use radioactive decay to measure...relative timeabsolute timehalf-livestime of day
- 2. Multiple ChoiceThe length of time required for half of the radioactive atoms in a sample to decay is its...eraagehalf-lifeeon
- 3. Multiple ChoiceHow does absolute age differ from relative age?only absolute dating indicates which rock is older than anotheronly absolute dating finds the age in yearsonly relative dating finds the age in years
- 4. Multiple ChoiceRadiometric dating is possible because the rates of decay of radioactive isotopes _____.change over timechange from place to placeare constantvary widely
- 5. Multiple ChoiceIf the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?25 years200 years400 years800 years
- 6. Multiple ChoiceThe original element that undergoes radioactive decay is known as the...daughter elementhalf-lifeparent elementcarbon-14
- 7. Multiple Choice
The element that is the product of radioactive decay is known as the...

daughter element

half-life

parent element

carbon-14

- 8. Multiple Choice
How many grams of Carbon-14 will remain after 17,100 years- C-14 has a half life 5,730 so 17,100 is about 3 half lives?

32 g

16 g

8 g

4 g

- 9. Multiple Choice
What percentage of Rubidium-87 will remain after 4 half-lives?

25%

12.5%

6.25%

3.125%

- 10. Multiple ChoiceYou find a rock sample with radioactive atoms present. If 25% of the original radioactive atoms were present, how many half-lives has the rock been around for? (Hint, at Half-Life = 0, you start with 100%)zero123
- 11. Multiple ChoiceTwo isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons.truefalse
- 12. Multiple ChoiceThe table shows the radioactive decay of carbon-14. Part of the table has been left blank.

After 22,800 years, approximately what percentage of the original carbon-14 remains?15%12.5%6.25%3.125% - 13. Multiple ChoiceThe graph shows the generalized rate of decay of radioactive isotopes over 5 half-lives.

If the original mass of a radioactive isotope was 24 grams, how many grams would remain after 3 half-lives?122436 - 14. Multiple ChoiceThe graph shows the radioactive decay of a 50-gram sample of a radioactive isotope.

According to the graph, what is the half-life of this isotope?100 years150 years200 years300 years - 15. Multiple ChoiceThe characteristic of the radioactive isotope uranium-238 that makes this isotope useful for accurately dating the age of a rock is the isotope’sorganic originconstant half lifecommon

occurrence in sedimentresistance to weathering - Answer choicesTagsAnswer choicesTags