Which of the following best describes the concept of half-life in radioactive decay?

The time it takes for half of the radioactive atoms in a sample to decay.

The time it takes for a radioactive substance to completely decay.

The time it takes for a radioactive substance to double in mass.

The time it takes for a radioactive substance to become non-radioactive.

Half-Lives

Quiz

•

Science

•

9th Grade

•

Practice Problem

•

Hard

•

NGSS

HS-PS1-8

Standards-aligned

Lisa Thompson

FREE Resource

15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

100.0g

50.0g

12.5g

8.5g

Tags

NGSS.HS-PS1-8

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following statements is true?

An unstable daughter isotope decays into a stable parent isotope.

An unstable parent isotope decays into a stable daughter isotope.

A stable daughter isotope decays into an unstable parent isotope.

A stable parent isotope decays into an unstable daughter isotope.

Tags

NGSS.HS-PS1-8

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

0.25g

2.5g

25g

80g

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

¹⁴₆C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?

4 years

5730 years

22,920 years

28,650 years

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 28 years. In what year will only 0.625 grams of this strontium-90 remain?

1988

2016

2044

2072

Tags

NGSS.HS-PS1-8

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The half life of iodine-131 is 8 days. What fraction of an iodine-131 sample will remain after 40 days?

1/2

1/64

1/5

1/32

Tags

NGSS.HS-PS1-8

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the definition of half-life?

Time it takes for half of the atoms in a radioactive substance to decay.

Time it takes for half of the atoms in a radioactive substance to combine.

Time it takes for all of the atoms in a radioactive substance to decay.

Time it takes for half of the atoms in a non-radioactive substance to decay.

Tags

NGSS.HS-PS1-8

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Half-Lives

15 questions

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

Which of the following statements is true?

Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

¹⁴₆C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?

A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 28 years. In what year will only 0.625 grams of this strontium-90 remain?

The half life of iodine-131 is 8 days. What fraction of an iodine-131 sample will remain after 40 days?

What is the definition of half-life?

A radioactive substance has a half-life of 10 years. If you start with 100 grams of the substance, how much will remain after 30 years?

A radioactive substance has a half-life of 2 hours. If you start with 500 grams of the substance, how much will remain after 6 hours?

The half-life of a radioactive isotope is 1 year. If you start with 1000 grams of the isotope, how much will remain after 3 years?

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Half-Lives

15 questions

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

Which of the following statements is true?

Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

146C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?

A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 28 years. In what year will only 0.625 grams of this strontium-90 remain?

The half life of iodine-131 is 8 days. What fraction of an iodine-131 sample will remain after 40 days?

What is the definition of half-life?

A radioactive substance has a half-life of 10 years. If you start with 100 grams of the substance, how much will remain after 30 years?

A radioactive substance has a half-life of 2 hours. If you start with 500 grams of the substance, how much will remain after 6 hours?

The half-life of a radioactive isotope is 1 year. If you start with 1000 grams of the isotope, how much will remain after 3 years?

Create a free account and access millions of resources

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¹⁴₆C has a half life of 5730 years, how many years would it take the 4.0 g sample to decay to 0.25 g?