A Radioactive Material Initially Is Observed to Have an Activity

question 1

Multiple Choice

A radioactive material initially is observed to have an activity of 1600 decays/sec.If six hours later it is observed to have an activity of 400 decays/sec,what is its half-life?

• A) six hours
• B) three hours
• C) twelve hours
• D) eight hours
• E) ​not enough information

---

Definitions:

Negative Freedom

The concept of freedom defined by the absence of constraints or interference from others, emphasizing what individuals are free from.

Sufficient

Adequate to meet the needs of a situation or a proposed end without needing more.

Sartre

Jean-Paul Sartre, a French existentialist philosopher, playwright, novelist, and political activist known for his explorations of freedom and existentialism.

Extreme Circumstances

Situations that are highly unusual or exceptional, often involving severe stress or urgency.