Chapter 18, Problem 46AE

(a)

Interpretation Introduction

Interpretation:

 Amount of $\text{cobalt -60}$ present after one half life has to be calculated.

Concept Introduction:

Half-life is time duration when concentration of reactant is reduced to half of its initial concentration. Radioactive substance decomposes thus for each successive half-life and becomes half of its earlier concentration and this reduction follows a exponential trend.

Initial concentration of a sample is amount of radioactive nuclide present before and decomposition or decay begins.

(b)

Interpretation Introduction

Interpretation:

Amount of $\text{cobalt -60}$ present after two half-lives has to be calculated.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

 Amount of $\text{cobalt -60}$ present after four half-lives has to be calculated.

Concept Introduction:

Refer to part (a).

(d)

Interpretation Introduction

Interpretation:

 Amount of $\text{cobalt -60}$ present after ten half-lives has to be calculated.

Concept Introduction:

Refer to part (a).