A Radioactive Material Initially Is Observed to Have an Activity

question 72

Multiple Choice

A radioactive material initially is observed to have an activity of 1 000 decays/sec.If three hours later it is observed to have an activity of 125 decays/sec,what is its half-life?

• A)1/2 hour
• B)1 hour
• C)3 hours
• D)8 hours

---

Definitions:

Marginal Cost

The escalation in aggregate cost linked to the fabrication of an extra item of a good or service.

Free Products

Products that are provided to consumers without monetary charge, often used as a business strategy to attract users or customers.

Firms

Businesses or enterprises that engage in commercial, industrial, or professional activities, whether for profit or not.

Society

A group of individuals living together in a more or less ordered community with shared laws, traditions, and values.