Answer:
SONAR
stands for Sound Navigation and Principle and working: It is based
on the principle of the reflection of sound wave (i.e. g echo).
It can be used to find the depth of the
ocean accurately. Powerful pulses of ultrasound are sent out at regular intervals
from a transmitter mounted on the ship.
When these pulses are intercepted by a distant object or even the sea
bottom, they get reflected. The reflected sound or echo is detected by
an underwater receiver which is also mounted on the ship. The time interval
between transmission and reception of the ultrasonic signal is recorded.
If v is the speed of ultrasound in sea water and t is the
elapsed time between the transmission and the reception of the ultrasound
signal at a point, then the distance of unseen object underwater is
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