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Nuclear Half Life

Assessment

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Deleted User

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Chemistry

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9th - 12th Grade

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483 plays

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Medium

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10 questions

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1.

Multiple Choice

2 mins

1 pt

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

2.

Multiple Choice

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

3.

Multiple Choice

30 sec

1 pt

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

1/2

1/3

1/16

1/8

4.

Multiple Choice

30 sec

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

5.

Multiple Choice

15 mins

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

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