Question

Sound travels much farther in water than light, and thus, is used for various underwater applications. A sonar signal sent to find the depth of ocean takes 4 s to return. What is the depth of the ocean at that location if the speed of sound in seawater is 1500 m/s^-1?

Answer 1

The signal takes 4 s to travel down and back, so the one-way time is $$2,\mathrm{s}$$. Therefore, the depth is $$1500 \times 2 = 3000,\mathrm{m}$$.