The radioactive element Unobtanium-189 (Ut-189) decays to the stable element Dilithium-171 (Di-171). The half-life of Ut-189 is 10 million years. Using a very sensitive atom-counter instrument, you determine that a mineral sample has 150 atoms of Di-171, and 50 atoms of Ut-189. Assume that no atoms have been lost due to metamorphism over the lifetime of the rock.Use this information to answer the following question.How many half-lives have passed since the mineral formed?
A. 1
B. 2
C. 3
D. 4
Answer: B
You might also like to view...
In many areas where natural gas lines are not available, homes are heated during the winter months by furnaces that burn propane. Calculate the amount of CO2 released into the atmosphere by 100,000 homes if each house consumes on average 600 gallons of propane during this period.
What will be an ideal response?
Describe some of the changes in weather conditions (winds, temperature, clouds, precipitation, pressure changes) you can observe as a cold front approaches and passes through your location.
What will be an ideal response?
You just purchased a new cell phone. Why is it a bad idea to throw the old one in the trash?
A) It contains radioactive elements. B) It contains heavy metals. C) It contains PCBs. D) It contains plastic. E) It is compostable.
What is the name given to a sequence of three bases on mRNA?
A) anticodon B) codon C) recognition site D) synthesis site