If You Obtained a Sample of Rock from Venus and Determined

question 27

Multiple Choice

If you obtained a sample of rock from Venus and determined the abundances of ²³⁸U and ²⁰⁷Pb in it,and found that for every one uranium atom there were three lead atoms,then what would the age of this rock be? Note that ²³⁸U decays to ²⁰⁷Pb with a half-life of 700 million years.Assume that there was no ²⁰⁷Pb in the rock when it originally formed.

• A) 1.4 billion years
• B) 2.8 billion years
• C) 230 million years
• D) 4.5 billion years

---

Definitions:

OSHA

The Occupational Safety and Health Administration, a federal agency responsible for ensuring safe and healthful working conditions for workers by setting and enforcing standards.

Violation

The act of disregarding or breaking a rule, agreement, law, or code of conduct.

Serious Injury

An injury that poses a substantial risk of death, causes extreme physical pain, or leads to significant and lasting bodily harm.

Death

The cessation of all biological functions that sustain a living organism, marking the end of its life.