Question

A sound signal from a ship on water reaches back to the ship 6 seconds after

hitting a rock under the water. (The speed of sound in sea water = 1500m/s)

a) In which wave form is sound propagated through water? (1)

b) Which phenomenon of sound caused the return of sound signal to the ship? (1)

c) Calculate the distance from the water surface to the rock.

Answer 1

a) sound waves
b)echo
c)Distance=Speed×time
=1500×6
=9000ms