If Originally There Were X Atoms of Radioactive Isotope Present

question 39

Multiple Choice

If originally there were X atoms of radioactive isotope present and now there are only X/2 atoms, how many half-lives have elapsed?

• A) 3
• B) 1
• C) 4
• D) 2

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Definitions:

Rating Scale

A method for assigning a value to a person's performance or characteristics, often in the form of a numbered or descriptive scale.

Alternation Ranking

A method of evaluating employees where individuals are compared and ranked alternately in terms of best and worst performance.

Performance Measurement

Performance measurement involves the evaluation of the effectiveness and efficiency of an individual, group, or organization's work activities and results.

Simple Ranking

Method of performance measurement that requires managers to rank employees in their group from the highest performer to the poorest performer.