Understanding Nuclear Decay and Half-Life

What is the main challenge in predicting when a specific nuclide will decay?

• The decay rate is too fast to measure.

• Individual decay events are unpredictable.

• The decay process is reversible.

• All nuclides decay at the same rate.

In the context of nuclear decay, what does the negative sign in the rate of decay formula indicate?

• The decay process is reversible.

• The decay process is accelerating.

• The number of nuclides is decreasing.

• The number of nuclides is increasing.

How is the half-life of a radioactive substance related to its decay constant?

• Half-life is the inverse of the decay constant.

• Half-life is equal to the natural log of 2 divided by the decay constant.

• Half-life is directly proportional to the decay constant.

• Half-life is unrelated to the decay constant.

If a sample has a half-life of 5 hours, how much of the original sample remains after 10 hours?

• One half of the original sample.

• One quarter of the original sample.

• None of the original sample.

• One eighth of the original sample.

After how many half-lives will a radioactive sample be reduced to 1/16th of its original amount?

• Four half-lives

• Two half-lives

• Six half-lives

• Eight half-lives