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4 December, 05:13

Boats use echo sounders. Pulses of sound waves are reflected by the sea bed and

detected by a sensitive microphone. The time between an echo sounder sending and

receiving a pulse is 0.005 s. The device calculates the depth of the sea, using the speed

of sound in sea water, which is 1500 m/s.

Use this information to calculate the depth of the sea. Show your working.

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Answers (1)
  1. 4 December, 07:13
    0
    Answer: depth = 3.75 m

    Explanation:

    Taken the speed of the sound in sea to be V = 1500 m/s

    The time between an echo sounder sending and receiving a pulse is 0.005 s. That is,

    Total time T = 0.005

    Formula for echo is:

    V = 2X/T

    Where X = distance covered

    Substitute V and T into the formula

    1500 = 2X/0.005

    Cross multiply

    7.5 = 2X

    Make X the subject of formula

    X = 7.5/2

    X = 3.75 m

    Therefore, the depth of the sea is 3.75 m
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