A Sample Initially Contains 3

question 81

Multiple Choice

A sample initially contains 3.2 moles of a radioactive isotope.How much of the sample remains after four half-lives?

• A)0.20 mol
• B)1.6 mol
• C)0.80 mol
• D)0.40 mol

---

Definitions:

Reinforcements

In behavioral psychology, stimuli which, when presented after a behavior, increase the likelihood of that behavior being repeated.

Deficiencies

The absence or lack of necessary qualities, skills, or resources.

Positive Consequence

A beneficial result or effect of an action or decision, often used to encourage desirable behaviors.

Promotion

The act of raising someone to a higher position or rank or the increasing of something's importance or value.