Calculating Distance with Sound Waves

[whitehorsey]

1. A certain instant camera determines the distance to the subject by sending out a sound wave and measuring the time needed for the echo to return to the camera. How long would it take the sound wave to return to the camera if the subject were 3.00 m away?


2. d = vt



3. d = vt
3 = 343t
t = 8.75 x 10^-3 sec

im not sure if this is correct.

 

[danago]

How far is the sound actually traveling in total? Is it really just 3m?

 

[whitehorsey]

How far is the sound actually traveling in total? Is it really just 3m?

yep its just 3m

 

[danago]

It travels 3m getting there, but what about the trip back to the camera? Its got to travel another 3m, for a total of 6m.

 

[whitehorsey]

oh i see thank you! :]