Question

Using sonar, sound pulses are emitted at the surface.
The pulses, after being reflected from the bottom,
are detected. If the time interval from the emission
to the detection of the sound pulses is 2 seconds,
find the depth of the water. (Take velocity of sound
through water, v = 1500 m/s.)
​

Answer 1

Answer:

1500 m

The sound pulse takes 1 s to reach bottom and 1 s to reach the surface from bottom. so,

d = v × t = 1500 m × 1 s = 1500 m.

Answer 2

We know that time taken by sonar to come back to itself is twice the time taken to reach sonar radiation to the surface.

Therefore Here,

time=1 second

speed=1500 m/sec

We know that, Speed=Distance/time

So, Distance=Speed×time

Distance=1500×1

=1500 m

Hence, the depth of the water is 1500 m.

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