A plane wave is described by the equation \[y=3\cos \left( \frac{x}{4} – McqOptions

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1.	A plane wave is described by the equation \[y=3\cos \left( \frac{x}{4}-10t-\frac{\pi }{2} \right)\]. The maximum velocity of the particles of the medium due to this wave is [MP PMT 1994]
A.	30
B.	\[\frac{3\pi }{2}\]
C.	3/4
D.	40
Answer» B. \[\frac{3\pi }{2}\]

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