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Period and frequency

Definition 1: Period

The period of a wave is the time taken by the wave to move one wavelength.

Definition 2: Frequency

The frequency of a wave is the number of wavelengths per second.

The period of a longitudinal wave is the time taken by the wave to move one wavelength. As for transverse waves, the symbol T is used to represent period and period is measured in seconds (s).

The frequency f of a wave is the number of wavelengths per second. Using this definition and the fact that the period is the time taken for 1 wavelength, we can define:

$f=1 T$(1)

or alternately,

$T=1 f$(2)