Sonar is an example of a use of ultrasound, it shows the depth of the sea, measured using sonar, at different distances from the shore. A technician on a boat uses sonar pulses to measure the depth of the sea when the boat is 120 m from the shore. Calculate the total time of travel for the sonar pulse used to make this measurement. The speed of the sonar pulse in seawater is 1600 m/s – 8007

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1. The equation is:
   v = x ÷ t

   Rearranging gives:
   t = x ÷ v

   Substitute the values:
   t = (14 × 2) ÷ 1600
   t = 28 ÷ 1600

   t = 0.018 seconds

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