A wave equation is given as $y = cos\,\,(500t - 70x),$ where $y$ is in $mm$, $x$ in $m$ and $t$ is in $sec$.
Diffcult
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$y=\cos (70 x-500 t)$
Transverse wave as particle oscillate perpendicular to the direction of motion
$\mathrm{V}=\frac{500}{70}=\frac{50}{7} \mathrm{m} / \mathrm{s}$
$\mathrm{f}=500=\frac{250}{\pi}$
$\lambda=\frac{2 \pi}{70} \mathrm{m}=\frac{20 \pi}{7} \mathrm{cm}$
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