Longitudo undae[1] est distantia super quam unda interatur, inter puncta consecutiva correspondentia cum eodem phase metata. Longitudo undae repraesentatur littera λ et ratiocinari potest a velocitate assidua v et frequentia f aequatione infra:[2]

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Longitudo unda (λ) metiri potest inter duo puncta.
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Photographema undarum aquariarum; longitudo undae repraesentatur littera λ.

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