## Standing wave

When more than two waves exist, the sum of them is expressed as superposition,
and becomes a standing wave.

W1=A1 exp(-j k1.r)

W2=A2 exp(-j k2.r)

W=W1+W2

|W| means the envelope of the standing wave.

[Image of traveling wave]

(Movie)

[Image of standing wave]

(Movie)

### [Animation]

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