(d) A pulse of ultrasound is emitted by a submarine, deep below the ice
sheet in the Arctic ocean as shown in the diagram below.
Icc
Water
Pulse of ultrasound
Submarine
(1) The first echo is detected 0.26 s after it was emitted. The speed of
ultrasound in water is 1500 m/s. Calculate the distance between
the submarine and the bottom of the ice.
You are advised to show clearly how you get your answer.