Question: A plane wave of frequency co propagates so that a certain phase of oscillation moves along the x, y, z axes with velocities v1, v2,

A plane wave of frequency co propagates so that a certain phase of oscillation moves along the x, y, z axes with velocities v1, v2, v3 respectively. Find the wave vector k, assuming the unit vectors ex, ey, ez of the coordinate axes to be assigned.

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