That depends on the information available. You can try to measure the frequency, with specialized equipment. Or, you might measure the wavelength and the speed instead, and use the basic relationship for waves (speed = wavelength x frequency).
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Period = 1/frequency = 1/500 = 0.002 second = 2 milliseconds
wave length = wave speed divided by its frequency
velocity = frequency multiply wavelength Rearrange the equation to find the frequency
The wave length would necessarily be one half. The speed would remain the same independent of the frequency.
You will have to measure it.