A Sample of Radon Gas Has an Activity of 140

question 31

Multiple Choice

A sample of radon gas has an activity of 140.0 mCi. If the half-life of radon is 1,500.0 y, how long before the activity of the sample is 10.0 mCi?

• A) 1,750 y
• B) 1,510 y
• C) 7,510 y
• D) 5,170 y
• E) 5,710 y

---

Definitions:

American Population

The total number of people living in the United States, encompassing a diverse range of ethnic, racial, and cultural backgrounds.

Suffrage

The right to vote.

W.B. Du Bois

An influential American sociologist, historian, and civil rights activist, co-founder of the NAACP, who advocated for the rights and advancement of Black Americans.