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The frequency of a wave is measured as the number of complete back-and-forth vibrations of a particle of the medium per unit of time. If a particle of air undergoes 1000 longitudinal vibrations in 2 seconds, then the frequency of the wave would be 500 vibrations per second.he frequency of a sound wave not only refers to the number of back-and-forth vibrations of the particles per unit of time, but also refers to the number of compressions or rarefactions that pass a given point per unit of time.
How does the frequency of a wave vary with the wave length? Wavelength(Î») is equal to the speed of the wave(v) divided by the frequency(f). Find the frequency of a sound wave moving in air at room temperature with the wavelength of 0.667m? At 20 degrees Celsius or 68 degrees Fahrenheit the speed of sound c = 343 m/s.