The displacement y of a particle in a medium can be expressed as: $y = {10^{ - 6}}\sin (100t + 20x + \pi /4)m,$ where $t$ is in second and $x$ in meter. The speed of wave is ... $m/s$
AIEEE 2004, Easy
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(b) $v = \frac{{{\rm{Co}} - {\rm{efficent}}\;{\rm{of}}\;t}}{{{\rm{Co}} - {\rm{efficent}}\;{\rm{of}}\;x}} = \frac{\omega }{k} = \frac{{100}}{{20}} = 5\,m/s.$
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