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The displacement of a standing wave on a...

The displacement of a standing wave on a string is given by
`y (x,t) = 0.4 sin (0.5x) cos (30t)`
where x and y are in centimetres.
(a) Find the frequency, amplitude and wave speed of the component waves.
(b) What is the particle velocity at `x=2.4 cm` at `t=0.8 s`?

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