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 receiving of wave is 1.6 s. What is the depth of the sea, if the velocity of sound in sea water is 1400 m $s^{-1}$?

• A. 1120 m
• B. 60 m
• C. 1400 m
• D. 112 m

Answer 1

The correct option is A 1120 m

Given,

Time period, $t=1.6s$

Velocity of sound in sea water $v=1400m{s}^{-1}$

Let $d$ be the depth of the sea,

Then the applying the formula, $v=\frac{2d}{t}$

Then, we get

$1400=\frac{2d}{1.5}$

$d=\frac{1400\times 1.6}{2}=1120m$