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Radioactivity — Quiz Answers

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1
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How does gamma decay differ from both alpha decay and beta decay?

A
A nucleus releases protons and neutrons.
B
A nucleus becomes more stable.
C
No new element forms.
D
No change in mass number occurs.
2
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What is the half-life of a radioisotope?

A
half of the time needed for a sample of radioisotope to become stable
B
the time needed for half of a sample of radioisotope to decay
C
the time needed before the first half of a radioisotope begins to decay
D
half of the time needed for a radioisotope to leave the body
4

Which describes why radioisotopes can be used as tracers in studying the biological and chemical processes of plants?

A
The radioisotope converts the nonradioisotope normally used by a plant into a radioisotope.
B
The radioisotope is absorbed more quickly than the nonradioisotope the plant normally uses.
C
The radioisotope travels through the plant without participating in any chemical processes.
D
The radioisotope is chemically identical to the nonradioisotope the plant normally uses.
6

Calcium-51 has a half-life of 4 point 5 days. Only 0 point 7 5 gram remains of a sample that was initially 12 grams. How old is the sample of calcium-51?

A
4 point 5 days
B
18 days
C
13 point 5 days
D
9 point 0 days
7

The half-life of cobalt-60 is 5 years. How old is a sample of cobalt-60 if only one-eighth of the original sample is still cobalt-60?

A
15 years
B
5 years
C
20 years
D
10 years
8

A 60 - g sample of radioactive isotope is measured after two half-lives have passed. What pair of percentages describes the sample after two half-lives?

A
25 percent unchanged and 75 percent stable
B
50 percent unchanged and 50 percent stable
C
12 point 5 percent unchanged and 87 point 5 percent stable
D
75 percent unchanged and 25 percent stable
9

The half-life of iodine-131 is 8 days. Chan Hee examines two samples of iodine-131. Sample 1 : 10 g Sample 2 : 20 g What can Chan Hee expect to observe about the samples after 16 days?

A
One-half of each sample will still be iodine-131.
B
The mass of iodine-131 in sample 1 will be 7 point 5 g and in sample 2 will be 16 g .
C
Ten grams of each sample will have undergone radioactive decay.
D
Three-fourths of each sample will have undergone radioactive decay.
10

Which characteristics of a radioisotope make it useful for diagnosing medical problems?

A
a short half-life and it is not taken up by the body
B
a long half-life and it is taken up by a specific part of the body
C
a short half-life and it is taken up by a specific part of the body
D
a long half-life and it is not taken up by the body

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Radioactivity — Quiz Answers — Physics