## Level 2

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

# Illustration **Harmonic plane wave (1d) - Propagation**

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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 \(t\).