Geography Middle School

Measurements of Carbon-14 in a skull indicate that 25% of the original amount remain. The half-life of Carbon-14 is 5,730 years. How old is the fossil?

A. 1,432 years old

B. 11,460 years old

C. 5,730 years old

D. 2,865 years old

Answers

Answer 1
Answer:

B. 11,460 years old

Explanation:

Half-life describes how long it takes for a sample to be reduced by 50%.

Half-Life of Carbon-14

Every isotope of different elements has different half-lives. The question states that the half-life of Carbon-14 is 5,730 years. This means that if there is a 100g sample of Carbon-14, then it will take 5,730 years for the sample to become 50g. Then, it will take another 5,730 for the sample to be reduced to 25g.

Determining Age

So, the age of a sample, or fossil, can be determined based on how many half-lives it has been through. We know that 25% of the sample remains. Starting at 100%, it takes one half-life to reach 50% and then a second half-life to reach 25%. This means that the sample of Carbon-14 has been through 2 half-lives. Since we know the length of the half-life, we can multiply 2 by 5,730 to determine the age of the sample.

2 * 5730 = 11460

The fossil is 11,460 years old.

Answer 2
B i think hope this helped hopefully right

Related Questions

According to fossil evidence, which life form appeared on Earth most recently?

A. algae (photosynthetic microorganism)

B. reptiles

C. flowering plants

D. fish

Answers

Answer: The answer is A

Explanation:

2.15 billion years ago. First undisputed fossil evidence of cyanobacteria, and of photosynthesis: the ability to take in sunlight and carbon

The answer is A
Photosynthesis is the the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water.

I need help

Which components are part of all scientific investigations? Check all that apply.

A: scientific question
B: procedure
C: hypothesis
D: variables
E: control
F: conclusion

Answers

Answer:c) hypothesis

Explanation:

Answer: All except control

Explanation:

From the experience of doing science labs, I have never seen control being added, however I have seen the rest. If you want it in order it should be:

A

C

D

B

and F.

Paleontologists uncovered several different sized tracks of the same prehistoric creature. What type of fossil would this be, and what could it indicate?

A. These body fossils indicate the animal might have lived alone.

B. These carbonized fossils indicate that the animal could fly.

C. These preserved fossils indicate the organism had a mating dance ritual.

D. These trace fossils indicate the animal might have traveled in herds or groups.

Answers

Answer: D

Explanation:

The different sizes suggest that they went in herds, including younglings.

D pls give me brainiest hope this helped

What are the positive and negative effects of the mountain-climbing trade on the local environment and economy? need it in 3-5 sentences thank u please please help this is overdue

Answers

Answer: I

Explanation:

Positive effects of the mountain climbing trade are if it costs money the economy will increase.Negative effect is that you are harming the wildlife that surrounds.
Hope that helps
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