The Cs-131 Nuclide Has a Half-Life of 30 Years

question 63

Multiple Choice

The Cs-131 nuclide has a half-life of 30 years. After 120 years, about 3 g remain. The original mass of the Cs-131 sample is closest to

• A) 30 g
• B) 70 g
• C) 60 g
• D) 50 g
• E) 40 g

---

Definitions:

Legally Valid

Having a status that is recognized and enforceable by law or within the legal system.

Satisfactory Performance

In contract law, the situation that exists when either personal taste or objective standards determine the contracting parties have performed their contractual duties according to the agreement.

Personal Tastes

Individual preferences or likes, particularly relating to aesthetic or consumption choices.

Contracting Parties

The entities or individuals who enter into a contract or legal agreement with each other.