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Half Life

Last updated over 3 years ago

5 questions

1

100g of Element X are found in a rock sample. Element X decays into Element Y and has a half-life of 1000 years.

1

1

1

1

Question 1

1.

How are half-lives useful for earth science?

Determines absolute age of rocks and fossils

Determines relative age of rocks and fossils

Determines superposition of rocks and fossils

Determines when a rock will disappear

Question 2

2.

How much Element X exists after one half life?

100g

50g

25g

12.5g

Question 3

3.

How much time has passed after 3 half lives?

1000 years

2000 years

3000 years

4000 years

Question 4

4.

After 2 half lives, there is 25g of Element X. How much Element Y is there in the sample?

125

100

75

50

Question 5

5.

A fossil is discovered with 25g of Element X. What is the absolute age of the fossil?

1000 years

2000 years

3000 years

4000 years