Quiz about Half Lives

Question 1

What is the Half life of this isotope?

Accepted Answer

10 seconds

Answer

5 seconds

Answer

15 seconds

Answer

20 seconds

Question 2

What is the Half Life of this isotope?

Accepted Answer

3 days

Answer

5 days

Answer

8 days

Answer

10 days

Question 3

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

Accepted Answer

25%

Answer

50%

Answer

12.5%

Answer

6.25%

Question 4

After one half life, a sample will begin to have more of the parent isotope than the daughter isotope.

Accepted Answer

FALSE

Answer

TRUE

Question 5

A sample will lose half of the parent isotope after 1 half life.

Accepted Answer

TRUE

Answer

FALSE

Question 6

Which is used in radioactive dating?

Accepted Answer

Carbon-14

Answer

Index fossils

Answer

Hydrochloric acid

Answer

Law of superposition

Question 7

What is the half-life of iodine-131?

Accepted Answer

8 days

Answer

32 days

Answer

16 days

Answer

24 days

Question 8

An isotope has a half life of 20 years. If it starts with a sample of 100g, how much of it will be left after 80 years?

Accepted Answer

6.25 grams

Answer

25 grams

Answer

50 grams

Answer

12 grams

Question 9

After 2 half lives have passed, what percent of the parent isotope is left?

Accepted Answer

25%

Answer

50%

Answer

75%

Answer

100%

Question 10

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 11

Actinium-226 has a half-life of 29 hours. If 100 mg of actinium-226 disintegrates over a period of 58 hours, how many mg of actinium-226 will remain?

Accepted Answer

25 mg

Answer

50 mg

Answer

12.5 mg

Answer

6.25 mg

Question 12

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 13

A radioactive isotope has a half-life of 5 years. If you start with a 160g sample, how much of the isotope will remain after 15 years?

Accepted Answer

20g

Answer

10g

Answer

40g

Answer

80g

Question 14

Which of the following statements about half-lives is TRUE?

Accepted Answer

The half-life of a substance is the time it takes for half of the substance to decay.

Answer

The half-life of a substance is the time it takes for the substance to completely decay.

Answer

The half-life of a substance is the time it takes for the substance to double in quantity.

Answer

The half-life of a substance is the time it takes for the substance to reach its maximum activity.

Question 15

A scientist measures the half-life of a new element to be 10 days. If the scientist starts with a 200g sample, how much of the sample will remain after 30 days?

Accepted Answer

50g

Answer

25g

Answer

100g

Answer

200g

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