Half-life

Presentation

•

Science

•

9th - 12th Grade

•

Hard

•

NGSS

HS-PS1-8

Standards-aligned

Tony Negus

FREE Resource

1 Slide • 23 Questions

Half-Life

By Tony Negus

Multiple Choice

What is the half-life of iodine-131?

32 days

8 days

16 days

24 days

Multiple Choice

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

1.25mg

1.25g

10g

10mg

Multiple Choice

If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?

1 half-life

2 half-lives

3 half-lives

4 half-lives

Multiple Choice

The diagram shows 32 atoms

32 of the Red are the parent isotope

0 of the atoms are daughter isotopes

How many half-lives have occurred?

Multiple Choice

What is Half-life?

The amount of time it takes for some of the nuclei in a sample of the isotope to decay

The amount of time it takes for half the electrons in a sample of the isotope to decay

The amount of time it takes for half the nuclei in a sample of the isotope to decay

the amount of time it takes to double the nuclei in a sample of the isotope to decay

Multiple Choice

The half life of isotope X is 2.0 years. How many years would it take for a 4.0 mg sample of X to decay and have only 0.50 mg of it remain?

6.0 years

3.0 years

8.0 years

2.0 years

Multiple Choice

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

Multiple Choice

After the third half-life, how much of the sample is left?

1/2

1/3

1/16

1/8

Multiple Choice

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

Multiple Choice

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

1.25mg

1.25g

10g

10mg

Multiple Choice

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

3.0g

0.25mg

0.3g

0.25g

Multiple Choice

If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?

1 half-life

2 half-lives

3 half-lives

4 half-lives

Multiple Choice

What is the half-life of iodine-131?

32 days

8 days

16 days

24 days

Multiple Choice

What is the Half life of this isotope?

5 seconds

10 seconds

15 seconds

20 seconds

Multiple Choice

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.
How many grams are left after 1 half life?

100 grams

25 grams

2 grams

50 grams

Multiple Choice

Selenium-83 has a half life of 25 minutes. How many minutes would it take for a 20 milligram sample to decay and only have 1.25 milligrams of it remaining?

25 minutes

50 minutes

75 minutes

100 minutes

Multiple Choice

The half-life of Zn-71 is 2.4 minutes. If 6.25 g of Zn-71 are needed for an experiment, how much should be prepared if it will take 9.6 minutes before the experiment can begin? (FIND M_i)

100.0g

50.0g

12.5g

8.5g

Multiple Choice

The half life of isotope X is 2.0 years. How many years would it take for a 4.0 mg sample of X to decay and have only 0.50 mg of it remain?

6.0 years

3.0 years

8.0 years

2.0 years

Multiple Choice

If the half-life of uranium-232 is 70 years, how long will it take for a 10.0 g sample to be reduced to 0.625 g?

232 years

17.5 years

140 years

280 years

Multiple Choice

What is the half life for this radioactive isotope?

5,700 years

11,400 years

17,100 years

28,500 yeats

Multiple Choice

The half life for a radioactive isotope is 10 years. How many half-lives have passed after 20 years?

1 half life

2 half lives

3 half lives

4 half lives

Multiple Choice

You start out with 8 grams of a radioactive isotope. How much radioctive isotope will be left after 2 half lives?

8 grams

4 grams

2 grams

1 gram

Multiple Choice

What is the Half Life of this isotope?

3 days

5 days

8 days

10 days

Half-Life

By Tony Negus

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