Chapter SH, Problem 10.7APP

To determine

To calculate: Time taken for a sound wave to return to the surface.

Answer to Problem 10.7APP

Time taken for the sound wave to return to the surface is $\underset{\_}{5\text{ s}}$ .

Explanation of Solution

Given:

Distance = $3800\text{ m}$

Speed = $1500\text{ m/s}$

Formula used:

Speed for an echo is given by,

  $v=\frac{2d}{t}$

where d is distance and tis time.

Calculation:

Time taken is calculated as:

  $\begin{array}{l}v=\frac{2d}{t}\\ t=\frac{2d}{v}\\ t=\frac{2\left(3800\text{ m}\right)}{1500\text{ m/s}}\\ t=5\text{ s}\end{array}$

Conclusion:

Time taken for the sound wave to return to the surface is $\underset{\_}{5\text{ s}}$ .