What makes using radioactive material useful for dating rock layers?

sedimentary rock layers don't have radioactive material

it can only be found in metamorphic rock

The time for 1/2 of radioactive atoms to decay

spontaneous breakdown of an atomic nucleus

Which best describes radiometric dating?

measuring the relative amounts of a radioactive isotope and a daughter product to figure out the age of a sample

using instruments that detect radioactivity to figure out how old something is

measuring how quickly the different radioactive isotopes in a sample decay to figure out the age of the sample

using short-wavelength electromagnetic radiation to determine the age of a sample

Before a half life occurs, how many parent isotope remains?

100% of the parent isotope remains

50% of the parent isotope remains

25% of the parent isotope remains

12.5% of the parent isotope remains

After one half life occurs, how many parent isotope remains?

50% (1/2) of the parent isotope remains

25% (1/4) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After two half life occurs, how many parent isotope remains?

25% (1/4) of the parent isotope remains

50% (1/2) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After three half life occurs, how many parent isotope remains?

12.5% (1/8) of the parent isotope remains

50% (1/2) of the parent isotope remains

25% (1/4) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After four half life occurs, how many parent isotope remains?

6.25% (1/16) of the parent isotope remains

50% (1/2) of the parent isotope remains

25% (1/4) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

After one half life...

50% (1/2) of the parent isotope remains

100% of the parent isotope remains

25% (1/4) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After two half life...

25% (1/4) of the parent isotope remains

100% of the parent isotope remains

50% (1/2) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After three half life...

12.5% (1/8) of the parent isotope remains

100% of the parent isotope remains

50% (1/2) of the parent isotope remains

25% (1/4) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After four half life...

6.25% (1/16) of the parent isotope remains

100% of the parent isotope remains

50% (1/2) of the parent isotope remains

25% (1/4) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

A scientists has found a rock sample that has 50% of its parent isotope that still remains. Given that the half life rate of the substance/rock is 500 years per half life, how many half lives have passed and how old is the rock?

1 half life have passed; the rock is 500 years old

0 half lives have passed; the rock is under 500 years old

0 half lives have passed; the rock is 500 years old

1 half life has passed; the rock is 1,000 years old

A scientists has found a rock sample that has 25% of its parent isotope that still remains. Given that the half life rate of the substance/rock is 500 years per half life, how many half lives have passed and how old is the rock?

2 half lives has passed; the rock is 1,000 years old

1 half life have passed; the rock is 500 years old

1 half life have passed; the rock is 1,000 years old

2 half lives have passed; the rock is 500 years old

A scientists has found a rock sample that has 12.5% of its parent isotope that still remains. Given that the half life rate of the substance/rock is 500 years per half life, how many half lives have passed and how old is the rock?

3 half lives has passed; the rock is 1,500 years old

2 half lives have passed; the rock is 1,000 years old

2 half lives have passed; the rock is 1,500 years old

3 half lives have passed; the rock is 1,000 years old

A scientists has found a rock sample that has 6.25% of its parent isotope that still remains. Given that the half life rate of the substance/rock is 500 years per half life, how many half lives have passed and how old is the rock?

4 half lives has passed; the rock is 2,000 years old

3 half lives have passed; the rock is 1,500 years old

3 half lives have passed; the rock is 2,000 years old

4 half lives have passed; the rock is 1,500 years old

After one half life...

50% (1/2) of the parent isotope remains

100% of the parent isotope remains

25% (1/4) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After two half life...

25% (1/4) of the parent isotope remains

100% of the parent isotope remains

50% (1/2) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After three half life...

12.5% (1/8) of the parent isotope remains

100% of the parent isotope remains

50% (1/2) of the parent isotope remains

25% (1/4) of the parent isotope remains

6.25% (1/16) of the parent isotope remains

After four half life...

6.25% (1/16) of the parent isotope remains

100% of the parent isotope remains

50% (1/2) of the parent isotope remains

25% (1/4) of the parent isotope remains

12.5% (1/8) of the parent isotope remains

A scientists has found a rock sample that has 50% of its parent isotope that still remains. Given that the half life rate of the substance/rock is 15 years per half life, how many half lives have passed and how old is the rock?

1 half life has passed; the rock is 15 years old

0 half lives have passed; the rock is under 7.5 years old

0 half lives have passed; the rock is 15 years old

1 half life have passed; the rock is 7.5 years old

A scientists has found a rock sample that has 25% of its parent isotope that still remains. Given that the half life rate of the substance/rock is 15 years per half life, how many half lives have passed and how old is the rock?

2 half lives have passed; the rock is 30 years old

1 half life have passed; the rock is 15 years old

1 half life has passed; the rock is 30 years old

2 half lives have passed; the rock is 15 years old

A scientists has found a rock sample that has 12.5% of its parent isotope that still remains. Given that the half life rate of the substance/rock is 15 years per half life, how many half lives have passed and how old is the rock?

3 half lives have passed; the rock is 45 years old

2 half lives have passed; the rock is 30 years old

2 half lives have passed; the rock is 45 years old

3 half lives have passed; the rock is 30 years old

A scientists has found a rock sample that has 6.25% of its parent isotope that still remains. Given that the half life rate of the substance/rock is 15 years per half life, how many half lives have passed and how old is the rock?

4 half lives have passed; the rock is 60 years old

3 half lives have passed; the rock is 45 years old

3 half lives have passed; the rock is 60 years old

4 half lives have passed; the rock is 45 years old

Which BEST describes the process of radioactive decay?

The breakdown of a radioactive isotope into stable, daughter isotopes

The process in which daughter isotopes turn into parent isotopes

The breakdown of a radioactive isotope into stable, parent isotopes

When half of the parent isotope becomes daughter isotopes

Which BEST describes what occurs when a radioactive substance or sample goes through a half life?

Half of the parent isotope becomes stable, daughter isotopes

Half of the daughter isotope becomes stable, parent isotopes

Unit 2 Lesson 3: Absolute Dating

Authored by Kevin Mac

Science

7th Grade

NGSS covered

Used 13+ times

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51 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which process would be most effective in determining the actual age of fossils embedded in rock?

relative dating

absolute dating

use of index fossils

use of core sampling

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

The length of time required for half of the radioactive atoms in a sample to decay is its...

era

age

half-life

eon

Tags

NGSS.HS-PS1-8

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The original element that undergoes radioactive decay is known as the...

daughter element

half-life

parent element

carbon-14

Tags

NGSS.HS-PS1-8

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How does absolute age differ from relative age?

only absolute dating indicates which rock is older than another

only absolute dating finds the age in years

only relative dating finds the age in years

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When an unstable radioactive atom decays, it usually turns into:

a more stable atom

a less stable atom

the exact same atom but with less pure energy

empty space

Tags

NGSS.HS-PS1-8

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called _____.

the daughter product

geologic time

the half-life

the half-time

Tags

NGSS.HS-PS1-8

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the breakdown of a radioactive isotope into a stable isotope of the same element or another element?

radiometric dating

radioactive decay

absolute dating

aging

Tags

NGSS.HS-PS1-8

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