Radioactivity

Question 1

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 2

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 3

12.525✔ 507587.5

Revolt · Accepted Answer

✔ 50

Question 4

12.5255075✔ 87.5

Revolt · Accepted Answer

✔ 87.5

Question 5

✔ 12.525507587.5

Revolt · Accepted Answer

✔ 12.5

Radioactivity Answers

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