The amount of time it takes for half of a sample to disappear is:

a
nuclear chemistry
b
half-life
c
fusion
d
fission

b) half-life

The correct answer is b) half-life.

In nuclear chemistry, the half-life is the time it takes for half of a sample to undergo radioactive decay and disappear. It is a characteristic property of each radioactive element or isotope. The remaining half of the sample will continue to decay over subsequent half-lives until it is almost entirely depleted.

The correct answer to the question is option b) half-life.

A half-life refers to the time it takes for half of the atoms in a radioactive sample to undergo decay or disintegrate. This concept is commonly used in nuclear chemistry to measure the rate at which a radioactive substance decays.

To arrive at this answer, you can follow these steps:

1. Understand the question: Read the question carefully and identify the concept being asked about.
2. Familiarize yourself with the options: Go through the given options and determine which one is associated with the described concept.
3. Analyze each option: Evaluate each option and eliminate those that are not relevant to the question.
4. Identify the correct option: After eliminating the incorrect options, identify the option that aligns with the concept being asked about.
5. Verify your answer: Double-check that your chosen option is indeed the correct one by cross-referencing it with your understanding of the topic.

In this case, the concept being asked about is the time it takes for half of a sample to disappear. This aligns with the definition of half-life, which makes option b) the correct answer.