Ultrasonic signal sent from SONAR returns to it after reflection from a rock after a lapse of 1s. If the velocity of ultrasound in water is 1600m/s, the depth of the rock in water is
300m
400m
500m
800m
A
800m
B
300m
C
400m
D
500m
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Solution
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If d is the distance of rock from SONAR then,
The distance covered by the sound wave is:
2d=vt
⇒d=v×t2
=1600×12=800m
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