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Question
A standing wave is formed by the superposition of two waves travelling in opposite directions. The transverse displacement is given by

y(x, t) = 0.5 sin $\left( {{{5\pi } \over 4}x} \right)\,$ cos(200 $\pi $t).

What is the speed of the travelling wave moving in the positive x direction ?

(x and t are in meter and second, respectively.)
160 m/s
90 m/s
180 m/s
120 m/s

Solution

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