A Radioactive Substance in the Laboratory Has a Half-Life of 8

question 11

Multiple Choice

A radioactive substance in the laboratory has a half-life of 8 h.At noon today,a Geiger counter reads 480 counts/min above background.At noon tomorrow,the counter should read about

• A)480 counts/min
• B)240 counts/min
• C)120 counts/min
• D)60 counts/min
• E)30 counts/min

---

Definitions:

Benchmarks

Standards or points of reference against which things may be compared or assessed.

Accountability

The obligation of an individual or organization to account for its activities, accept responsibility for them, and disclose the results in a transparent manner.

Groupthink

A psychological phenomenon that occurs within a group of people when the desire for harmony or conformity results in an irrational or dysfunctional decision-making outcome.

Critical Evaluator

Someone skilled in assessing situations, ideas, or projects thoroughly and objectively to judge their worth or significance.