By counting the number of crests that pass a point in a specific amount of time, one may determine the frequency of a waveform. Option a is correct.
A sound pressure wave's frequency, also known as pitch, is the number of times it repeats itself every second.
The frequency of the sound is the inverse of the period. If the wavelength of a wave is short. The wave will indeed have a lower frequency. A longer wavelength denotes a lower frequency.
The frequency of a waveform is found by determining the number of crests passing a point in a given time.
Hence option a is correct.
To learn more about the frequency of the sound, refer to the link https://brainly.com/question/1435829.
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