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Is é ‘fad buille’ an t-achar nach mór do dhá chomhartha atá polaraithe go hortagánach dul, i gcomhphas ar dtús, chun pasdifríocht dhá raidian Pí a bhaint amach.
“Beat length” is the distance over which two orthogonally polarised signals, initially in phase, must pass in order to achieve a 2 Pi radian(s) phase difference.