I am having a problem with the following question. A car is moving at 30 m/s. The cars horn is emmitting a 220 hz sound. The speed of sound is 343 m/s. How far does the the car move in one period of the sound emitted from the horn. I am having a problem determining the distance formula. The period of the 220 hz sound is 1/220hz = 4.54 ms so in 4.54 ms the sound has travelled 1.55722 meters (343 * .00454) Now the distance the car travels would be (4.54 ms * 30 m/s) = .1362 meters Is this the correct way to go about this problem?