An echo-sounder in a traveler (fishing boat) receives an echo from a shoal of fish 0.4s after it was sent. If the speed of sound in water is 1500 m/s, how deep is the shoal?

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150 m

300 m

600 m

7500 m

answer is B.

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Detailed Solution

Given:
Speed of sound in water: 1500 m/s
Total Time: 0.4s
Deep(distance travelled)?
Speed = distance travelled/time taken
1500 = distance travelled / 0.4
1500 x 0.4 = distance travelled
600 = distance travelled
Distance between boat and shoal of fish is 600/2 = 300m

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