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[tex]

\phi_1 = \vec k \cdot \vec r - \omega t.

[/tex]

How can you determine in which direction this wave is propagating? I guess, more specifically, how does a wave described by this phase differ from a wave described by the phase

[tex]

\phi_2 = \vec k \cdot \vec r + \omega t

[/tex]

I may not have provided enough detail...please tell me if I haven't! Thanks.