Chapter 13, Problem 33E

Interpretation Introduction

Interpretation:

The time required by $10\%$ of $\text{U-238}$ atoms to decay and the number of $\text{U-238}$ atoms in the universe is to be calculated.

Concept introduction: The half-life is a characteristic constant that measures the time required for a given substance to reduce half of its concentration in the reaction.

To determine: The time required by $10\%$ of $\text{U-238}$ atoms to decay and the number of $\text{U-238}$ atoms in the universe.