Quiz about Basic Half-Life practice

Question 1

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?

Accepted Answer

3 half-lives

Answer

1 half-life

Answer

2 half-lives

Answer

4 half-lives

Question 2

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.

Accepted Answer

1.25mg

Answer

1.25g

Answer

10g

Answer

10mg

Question 3

What is the half-life of iodine-131?

Accepted Answer

8 days

Answer

32 days

Answer

16 days

Answer

24 days

Question 4

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?

Accepted Answer

12.5g

Answer

100.0g

Answer

50.0g

Answer

8.5g

Question 5

Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone?

Accepted Answer

3.34 seconds

Answer

0.334 seconds

Answer

1.77 seconds

Answer

13.4 seconds

Question 6

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?

Accepted Answer

2.5g

Answer

0.25g

Answer

25g

Answer

80g

Question 7

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?

Accepted Answer

3 half-lives

Answer

1 half-life

Answer

2 half-lives

Answer

4 half-lives

Question 8

Geologist use the time it takes for a radioactive isotope to decay to half its original mass called a___________.

Accepted Answer

half-life

Answer

radioactive decay

Answer

isotope

Answer

carbon dating

Question 9

An isotope of cesium (cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain?

Accepted Answer

0.125 mg

Answer

0.5 mg

Answer

0.25 mg

Answer

0.0625 mg

Question 10

What is the Half life of this isotope?

Accepted Answer

10 seconds

Answer

5 seconds

Answer

15 seconds

Answer

20 seconds

Question 11

What is the Half Life of this isotope?

Accepted Answer

3 days

Answer

5 days

Answer

8 days

Answer

10 days

Question 12

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?

Accepted Answer

50 grams

Answer

100 grams

Answer

25 grams

Answer

2 grams

Question 13

The graph shows the radioactive decay of a 50-gram sample of a radioactive isotope.
According to the graph, what is the half-life of this isotope?

Accepted Answer

200 years

Answer

100 years

Answer

150 years

Answer

300 years

Question 14

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?

Accepted Answer

0.25g

Answer

3.0g

Answer

0.25mg

Answer

0.3g

Question 15

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

Accepted Answer

1/8

Answer

1/2

Answer

1/3

Answer

1/16

Question 16

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?

Accepted Answer

0.25g

Answer

3.0g

Answer

0.25mg

Answer

0.3g

Question 17

The % of the parent isotope remaining after 1 Half Life.

Accepted Answer

50%

Answer

25%

Answer

12.5%

Answer

6.25%

Question 18

The % of the parent isotope remaining after 2 Half Lives.

Accepted Answer

25%

Answer

50%

Answer

12.5%

Answer

6.25%

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