Radioactivity - Quiz Quiz

Question 1

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

Revolt · Accepted Answer

C: No new element forms.

Question 2

What is the half-life of a radioisotope?

Revolt · Accepted Answer

B: the time needed for half of a sample of radioisotope to decay

Question 3

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

Revolt · Accepted Answer

D: The radioisotope is chemically identical to the nonradioisotope the plant normally uses.

Question 4

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?

Revolt · Accepted Answer

B: 18  days

Question 5

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?

Revolt · Accepted Answer

A: 15 years

Question 6

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?

Revolt · Accepted Answer

A: 25 percent  unchanged and  75 percent  stable

Question 7

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?

Revolt · Accepted Answer

D: Three-fourths of each sample will have undergone radioactive decay.

Question 8

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

Revolt · Accepted Answer

C: a short half-life and it is taken up by a specific part of the body

Radioactivity - Quiz Quiz Answers

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