Lab: Half-Life Answers

After each half-life cycle, all✔ halfnonemore of the radioactive nuclei became nonradioactive.

During the experiment, the number of radioactive atoms never increased because a radioactive nucleus likely, but not definitelypossibly, but not likely✔ neverdefinitely becomes radioactive again after it decays.

Your simulation involved 100 atoms and eight half-life cycles. For half-life cycles 9 and later, how many radioactive nuclei would you expect to be present? ✔ 01234510It depends on the cycle.

y-axis is Half-Life Cycles✔ Radioactive AtomsDecayed Atoms.

Why is the regression equation not exactly y = 100 • 0.5n? ✔ Radioactive decay is a random event.Some atoms became radioactive again.Simulation cannot really model half-life.Half-life is not a real thing.

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You could also graph decay time (in seconds or minutes) vs. number of radioactive nuclei. How would this graph differ from the graph of cycle number vs. number of radioactive nuclei? Check all that apply.

What is the relationship between the number of half-life cycles and the elapsed time in seconds or minutes?

The graph provided shows the accumulation of nonradioactive atoms during the decay of a radioactive substance. Which color graph represents the relationship between the number of half-life cycles and the number (out of 100 nonradioactive atoms) present in a radioactive sample that decays? orange✔ bluegreenpink

Suppose you could watch radioactive atoms decay. It would probably get quite boring as time went by. Why? Check all that apply.

50%25%12.5%✔ 6.25%

6.750 x 10113.375 x 10111.687 x 1011

A times 0.5 to the n power. StartFraction 0.5 to the n power over A EndFraction. 0.5 to the n power. A plus 0.5 to the n power.

The half-life of Carbon-14 is 5730 years. When did the animal die? Approximately 5730 11,46017,190✔ 28,650 years ago.

You’ve found some fossil bones while digging in your backyard. Could they be dinosaur bones? Using carbon dating, you determine that 3% of the original radioactive carbon-14 is still radioactive. (The rest has decayed into nitrogen-14.) How many half-life cycles has it gone through?Approximately 1357 half-life cycles.