1.

The plane wave is described by the equation
y=3cos (x/4-10t- /2),

A. nWhere c is in meters and t in seconds. The maximum velocity of the particles of the medium due to this is?
B. 30m/s
C. 3 /2 m/s
D. 3/4 m/s
E. 40m/s
Answer» B. 30m/s


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