Find the speed of propagation of the wave

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Find the speed of propagation of the wave y=0.01sin⁡(2πx0.40−180πt)y=0.01\sin\bigl(\dfrac{2\pi x}{0.40}-180\pi t\bigr), where xx is in metres and tt in seconds. (a) 18 m s−118\,\text{m\,s}^{-1} (b) 90 m s−190\,\text{m\,s}^{-1} (c) 36 m s−136\,\text{m\,s}^{-1} (d) 72 m s−172\,\text{m\,s}^{-1}

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