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Unformatted text preview: surface. Therefore, the boat must be traveling faster than the speed of the water waves. Exercise 26. We know that the beat frequency is the difference in the two frequencies. Therefore, the unknown tuning fork must have a frequency that is either 2 Hz higher or 2 Hz lower than the tuning fork with the 360-Hz frequency. 360 Hz 2 Hz 358 Hz or 362 Hz f f-= = The analogous reasoning applies to the second tuning fork. 355 Hz 3 Hz 352 Hz or 358 Hz f f-= = Therefore, the frequency must be 358 Hz as it is the only frequency in common....
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- Fall '02