Question

A sonar echo returns to a submarine 1.20 s after being emitted. what is the distance to the object creating the echo? (assume that the submarine is in the ocean, not in fresh water.)

Answer 1

I found: `918.6m`

Explanation:

Considering (from the literature) a speed of sound of `1531m/s` we have:

`"speed"="distance"/"time"` where distance is twice `d` (going to and coming back from the object), so:
`1531=(2d)/1.2`

`d=(1.2*1531)/2=918.6m`