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Which of the following represents (a) a ...

Which of the following represents (a) a progressive wave and (b) a stationary wave?
(a) `y=2 cos 5x sin 9t," "(b) y=2 sqrt(x-vt)`,
(c) `y=3 sin (5x-0.5 t)+4 cos (5x-0.5 t)`
(d) `y= cos x sin t+cos 2x. Sin 2t`. If progressive, find its velocity.

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The correct Answer is:
Stationary, (b) not a wave, (c) progressive, `v=0.1 m//s`, (d) stationary
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