# Sonar waves

1. Jan 30, 2014

### rootdawg56

1. The problem statement, all variables and given/known data
A sonar echo returns to a submarine 1.10s after being emitted. What is the distance to the object creating the echo?

2. Relevant equations

rate X time = distance

3. The attempt at a solution( 1533m/s X 1.01s) divided by 2 = distance

2. Jan 30, 2014

### Staff: Mentor

It looks like you're on the right track. What answer did you get?

3. Jan 30, 2014

### rootdawg56

The answer I came up with 744.165m

4. Jan 30, 2014

### BvU

I take it the 1533 m/s is the speed of sound under water ? If so, you should mention it under 'given/known' data. That prevents we have to guess after what you were given to do the exercise.

As a physicist, I would say that the 1.10 s has three significant digits at most. So the answer shouldn't have more than 3 digits, (max 4 if the first is a 1).

5. Jan 30, 2014

### Staff: Mentor

To be even more accurate in the real world, you'd need to specify the depth, the temperate and salinity too but that's beyond the scope of this problem.

http://en.wikipedia.org/wiki/Underwater_acoustics