The equation of a wave travelling in a string can be written as $y = 3\cos \pi (100\,t - x)$. Its wavelength is .... $cm$
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(b) Comparing the given equation with $y = a\cos (\omega \,t - kx)$
We get $k = \frac{{2\pi }}{\lambda } = \pi ==> \lambda = 2cm$
We get $k = \frac{{2\pi }}{\lambda } = \pi ==> \lambda = 2cm$
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