QUESTION 7 Measurements of radioactive C-14 isotope in a mammoth\'s bone showed

Question

QUESTION 7 Measurements of radioactive C-14 isotope in a mammoth's bone showed that only 1/16th of the original isotope remains today. Since the half-life of C-14 is 5,730 years, the best estimate for the age of this bone is years. QUESTION 8 A paleontologist finds a fossil mollusk and uses Carbon isotopes to determine that its age is 16,000 years old. In a different layer of sediment 10 inches directly above where he found the mollusk, he discovers a fossil starfish. Without any additional analysis, he can use to correctly conclude that the starfish is absolute dating: younger than 16,000 years old relative dating; younger than 16,000 years old relative dating; older than 16,000 years old absolute dating: exactly 16,000 years old absolute dating; older than 16,000 years old

Explanation / Answer

7) 358.125 years.

--> Half life is the time it takes half the mass of a given amount of a radio active parent isotope to decay to its daughter isotopes.

8) relative dating younger than16000 years old.

--> relative dating is the science of determining the relative order of past events.ie age of an object in comparision to another.

--> As the fossil starfish is 10 inches above ,we can say its younger than the mollusk.

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