Obtain relationship between the time period and frequency.
If T is the time period of a wave, then by definition
In time T, the number of waves = 1
∴ In 1 second, number of waves (or frequency) =
f=1T\text f = \dfrac{\text{1}}{\text{T}}f=T1
Thus,
frequency=1Time period\text{frequency} = \dfrac{\text{1}}{\text{Time period}}frequency=Time period1
or
time period=1frequency\text{time period} = \dfrac{\text{1}}{\text{frequency}}time period=frequency1
