Radioactivity

Question 1

Which statements best describe the work of Marie and Pierre Curie? Check all that apply.They discovered radioactivity.They came up with the term “radioactivity.”They conducted experiments with uranium-containing minerals and pure uranium.They conducted experiments with uranium-containing minerals and photographic plates.They discovered two new radioactive elements.

Revolt · Accepted Answer

B: They came up with the term “radioactivity.”; C: They conducted experiments with uranium-containing minerals and pure uranium.; E: They discovered two new radioactive elements.

Question 2

Which statements best describe the process of radioactive decay? Check all that apply.An unstable isotope changes until it reaches a different element that is unstable.An unstable isotope changes until it reaches a different element that is stable.A stable isotope changes until it reaches a different element that is unstable.A stable isotope changes until it reaches a different element that is stable.An unstable isotope changes until it reaches a different isotope of the same element that is unstable.An unstable isotope changes until it reaches a different isotope of the same element that is stable.

Revolt · Accepted Answer

B: An unstable isotope changes until it reaches a different element that is stable.; F: An unstable isotope changes until it reaches a different isotope of the same element that is stable.

Question 3

Matilda has a 100 g rock sample. She knows that the rock contains uranium-238 and that the half-life of uranium-238 is 4.5 X 109 years. If she cuts the rock sample in half, what happens to the half-life of the uranium?

Revolt · Accepted Answer

C: The half-life remains the same.

Question 4

The half-life of carbon-14 is 5730 years. How long will it take for 7/8 of a sample of carbon-14 to decay?

Revolt · Accepted Answer

B: 17,190 years

Question 5

Which statements best describe medical uses for radioactive isotopes? Check all that apply.Radioactive isotopes are used to detect medical problems.High-energy gamma rays are injected into the body.Radioactive isotopes are used to treat some diseases.Radiation is used to kill cancer cells.Radioactive isotopes are directed at tumors from outside the body.

Revolt · Accepted Answer

A: Radioactive isotopes are used to detect medical problems.; C: Radioactive isotopes are used to treat some diseases.; D: Radiation is used to kill cancer cells.

Question 6

Archaeologists use radioactive isotopes to .

Revolt · Accepted Answer

C: determine the age of ancient artifacts

Question 7

Scientists use radioactive isotopes in agriculture to .

Revolt · Accepted Answer

A: understand the biological and chemical processes in plants

Question 8

Geologists use radioactive isotopes to .

Revolt · Accepted Answer

B: determine the age of rocks and fossils

Radioactivity Answers

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