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Question

An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and the receiving of the wave is 1.5s. Calculate the depth of the sea, if the velocity of sound in sea water is 1400ms-1.


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Solution

Step 1: Given data:

Time interval t=1.5sec.
Velocity V=1400ms-1

Step 2: Formula used:

d=v×t
Where v is the velocity, t is the time interval, d is the distance traveled by ultrasonic waves during 1.5s

Step 3: Calculating the depth of the sea:

Let, the Depth of the sea is x,

Distance traveled by a sound wave=2d,

Time is taken by sound to travel both ways=1.5s

Speedofthesound=totaldistancetraveledtimetaken

1400=2d1.5d=1400×1.52d=1050m

Hence, the depth of the sea is 1050m


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