Lab: Half-Life Model

Question 1

Use the drop-down menus to complete each sentence.

Revolt · Accepted Answer

During the first simulation, approximately of the radioactive atoms became stable after each half-life.: 50%; During the second simulation, approximately of the radioactive atoms became stable after each half-life.: 50%

Question 2

Which line on the graph represents the radioactive decay of an isotope?

Revolt · Accepted Answer

the blue line

Question 3

Which line on the graph represents the accumulation of stable atoms during the decay of a radioactive substance?

Revolt · Accepted Answer

the orange line

Question 4

Arianna finds some fossil bones while digging in her backyard. Could they be dinosaur bones? Using carbon dating, she determines that 3% of the original radioactive carbon-14 is still radioactive. (The rest has decayed to nitrogen-14.)

Revolt · Accepted Answer

The half-life of carbon-14 is 5,730 years. This means that the animal died approximately years ago.: 28,650

Question 5

17,19022,920✔ 28,65034,380

Revolt · Accepted Answer

✔ 28,650

Question 6

Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Use the drop-down menus to complete each sentence.

Revolt · Accepted Answer

In this experiment, the number of was intentionally changed. This was the independent variable.: half-lives; The dependent variable measured was the number of .: radioactive atoms

Question 7

X radioactive atomsstable atoms✔ half-lives

Revolt · Accepted Answer

✔ half-lives

Question 8

✔ radioactive atomsX stable atomshalf-lives

Revolt · Accepted Answer

✔ radioactive atoms

Lab: Half-Life Model Answers

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