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Longitudo undae
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 frequentiaf aequatione infra:[2]
↑Pontificia Accademia delle scienze, Memorie, Vol. 21–22 (1908), p. 249.