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Frequency is the number of occurrences of a repeating event per unit time
 the wavelength of a sinusoidal wave is the spatial period of the wave
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With reference to sound waves,

Frequency means the number of oscillations completed by the sound wave in 1 second. It is denoted by f. It is also the reciprocal of Time Period.
So, f = 1/T

Wavelength means the distance between any two condensations or the distance between any two rarefactions. (Since sound is a longitudinal wave). It is denoted by Greek letter λ (Lambda).

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