Question

The deepest part of the oceans in our world is the Mariana Trench in the Pacific Ocean. It is around 11000 m deep. How long will it take for a signal sent from a ship above this trench to be reflected back? (The speed of sound in water = 1500 m/s.)

Answer 1

Given: Speed of sound in water = v = 1500 m/s

Depth of the Mariana Trench in the Pacific Ocean = d = 11000 m

Let us assume that the time taken by a signal sent from a ship above the trench to be reflected back is t.

Total distance travelled by a signal = 2d

Time = Distance / speed

t = 2d / v

t = (2 $\times$ 11000) / 1500

t = 14.67 sec.

Thus, the time taken for a signal sent from a ship above the trench to be reflected back (t) is 14.67 sec.