hiker is 685 meters away from a vertical cliff. wavelength is 0.750 meters what is frequency?

you need the speed of the wave. Is it sound?

V/F = 0.75,

344/F = 0.75.
0.75F = 344,
F = 459 cps = 459 Hz.

To determine the frequency of a wave, you need the speed of the wave and the wavelength. However, in this case, we are missing the speed of the wave. Therefore, we cannot determine the frequency with the given information.

Typically, to calculate the frequency of a wave, you can use the formula:

frequency = speed / wavelength

If we had the speed of the wave, we could plug in the values and find the frequency. However, without that information, we cannot provide a specific answer. If you have any additional information or if there is a different approach to your question, please let me know and I will be happy to help you further.