Question
A ship sends out ultrasound that return from the seabed and is detected after 5 s. If the speed of ultrasound through seawater is 1600 ms−1, what is the distance of the seabed from the ship?
Answer: Option C
:
C
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C
Given:
Speed of ultrasound in seawater, v=1600 ms−1
Time for sound to travel from ship to seabed and then back, t=5 s
Let the distance between ship and seabed be d.
The total distance travelled by the sound waves will be 2d.
Distance travelled by the wave is the product of speed and time.
2d=vt=1600×5=8000 m
d=80002=4000 m=4 km
Hence, the distance of seabed from ship is 4 km
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