# IllustrationHarmonic plane wave (1d) - Propagation

Level 2
Level 2 requires school mathematics. Suitable for pupils.

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A one-dimensional harmonic plane wave $$\mathit{\Psi}(x,t)$$ propagating to the right:$\mathit{\Psi}(x,t) ~=~ A \, \cos(k\,x - \omega \, t)$where $$A$$ is the amplitude, $$k$$ is the wave number and $$\omega$$ is the frequency of the wave.

The wave at the time $$t = 0$$ and at a later time $$t$$.