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Illustration Frequency of a Sinusoidal Wave

Frequency of a Sinusoidal Wave
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Shown is a sinusoidal wave as a function of time \(t\). The frequency \(f\) indicates how often a period \(T\) fits into one second. In the presented sine wave, 2 and 1/2 periods occur within one second, therefore the frequency is \( f = 2.5 \, \frac{1}{\mathrm s} = 2.5 \, \mathrm{Hz} \).