The equation of a plane progressive wave is given by $y = 0.025\sin (100t + 0.25x)$. The frequency of this wave would be
A$\frac{{50}}{\pi }Hz$
B$\frac{{100}}{\pi }Hz$
C$100 Hz$
D$50 Hz$
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A$\frac{{50}}{\pi }Hz$
a (a) Compare the given equation with $y = a\sin (\omega t + kx)$.
We get $\omega = 2\pi n = 100$ ==> $n = \frac{{50}}{\pi }Hz$
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