The equation of a transverse wave is given by $y = 100\,\sin \pi (0.04z - 2t)$ where $y$ and $z$ are in $cm$ and $t$ is in seconds. The frequency of the wave in $Hz$ is
A$1$
B$2$
C$25$
D$100$
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A$1$
a (a) Here $\omega = 2\pi n = 2\pi \Rightarrow n = 1$
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