Question

A stationary ship is tracking an experimental submarine directly below the vessel. Its sonar sends a  47 kHz signal towards the submarine.(for this problem you need to compute carefully, the tolerance is less than 1%)

If the submarine is diving straight down below the ship at a speed of 15 m/s, what is the frequency heard by the submarine if the speed of sound in the water is 1475 m/s?

What is the frequency of the echo of the sonar received from the submarine at the ship?

If the submarine is at  2660m depth when the signal is emitted, how much time after emission, does the sonar detect the echo?

Answer 1