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**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.

3 = 343t

t = 8.75 x 10^-3 sec

im not sure if this is correct.