Chapter 20, Problem 20.21QP

Interpretation Introduction

Interpretation:

The fraction of the isotope remains after 449 days has to be calculated.

Concept introduction:

The decay constant used to define the quantity of radioactive material that remains after time period has gone.  The fraction of material that leftovers after a time period gas gone is the ratio of the number of radioactive nuclei ( ${\text{N}}_{\text{g}}$) in the real sample when the measurement happening.  This segment is frequently expressed as a percent.

The equation relating fraction of nuclei after a period of time has elapsed to the decay constant $\text{(ln}\frac{{\text{N}}_{\text{t}}}{{\text{N}}_{\text{g}}}\text{= -kt)}$