Radioactivity

Question 1

Which statements best describe half-lives of radioactive isotopes? Check all that apply.The half-life varies depending on the isotope.The half-life is the same for every isotope.Half-lives are always only minutes long.Half-lives range from fractions of a second to billions of years.The half-life of a particular isotope is constant.The half-life of a particular isotope changes constantly.

Revolt · Accepted Answer

The half-life varies depending on the isotope.; Half-lives range from fractions of a second to billions of years.; The half-life of a particular isotope is constant.

Question 2

Summarize the history of radioactivity by choosing the scientist(s) involved with each discovery.

Revolt · Accepted Answer

✔ Marie and Pierre Curie; conducted experiments with uranium-containing minerals and pure uranium.: Marie and Pierre Curie; came up with the term “radioactivity.”: Marie and Pierre Curie; showed that uranium in a mineral gave off radiation even without being exposed to the Sun.: Antoine Henri Becquerel; discovered radium and polonium.: Marie and Pierre Curie; conducted experiments with fluorescent minerals and photographic plates.: Antoine Henri Becquerel

Question 3

Antoine Henri Becquerel✔ Marie and Pierre CurieJohn DaltonAntoine Lavoisier

Revolt · Accepted Answer

✔ Marie and Pierre Curie

Question 4

✔ Antoine Henri BecquerelMarie and Pierre CurieJohn DaltonAntoine Lavoisier

Revolt · Accepted Answer

✔ Antoine Henri Becquerel

Question 5

Antoine Henri Becquerel✔ Marie and Pierre CurieJohn DaltonAntoine Lavoisier

Revolt · Accepted Answer

✔ Marie and Pierre Curie

Question 6

✔ Antoine Henri BecquerelMarie and Pierre CurieJohn DaltonAntoine Lavoisier

Revolt · Accepted Answer

✔ Antoine Henri Becquerel

Question 7

Complete these sentences by selecting the correct answers from the drop-down menus.

Revolt · Accepted Answer

After one half-life, % of the atoms will change to a stable isotope and % will remain radioactive.: 50; After three half-lives, % of the atoms will change to a stable isotope and % will remain radioactive.: 87.5; After three half-lives, % of the atoms will change to a stable isotope and % will remain radioactive.: 12.5

Question 8

12.525✔ 507587.5

Revolt · Accepted Answer

✔ 50

Question 9

12.5255075✔ 87.5

Revolt · Accepted Answer

✔ 87.5

Question 10

✔ 12.525507587.5

Revolt · Accepted Answer

✔ 12.5

Radioactivity Answers

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