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A wave equation is given by \( y=4 \sin \left[\pi\left(\frac{x}{9}-\frac{t}{5}+\frac{1}{6}\right)\right] \) where, \( x \) is in \( \mathrm{cm} \) and \( t \) is in second. The wave number of the wave is
(a) \( \frac{\pi}{9} \mathrm{rad} \mathrm{cm}^{-1} \)
(b) \( \frac{1}{6} \mathrm{rad} \mathrm{cm}^{-1} \)
(c) \( \frac{\pi}{5} \mathrm{rad} \mathrm{cm}^{-1} \)
(d) \( \frac{2 \pi}{9} \mathrm{rad} \mathrm{cm}^{-1} \)
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