A plane wave of frequency \( \omega \) propagates so that a certain phase of oscillation moves a...

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A plane wave of frequency \( \omega \) propagates so that a certain phase of oscillation moves along the \( x, y, z \) axes with velocities \( v_{1}, v_{2}, v_{3} \) respectively. Find the wave vector \( \mathbf{k} \), assuming the unit vectors \( e_{x}, e_{y}, e_{z} \) of the coordinate axes to be assigned.
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