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Siinusvõnkumise lainepikkus 
    {\displaystyle \scriptstyle \lambda }
Siinusvõnkumise lainepikkus

Lainepikkuseks nimetatakse füüsikas kaugust kahe teineteisele lähima samas faasis võnkuva punkti vahel. Siinuslaines on lainepikkuseks näiteks vahemaa kahe lähima laineharja või lainenõo vahel.

Lainepikkust tähistatakse kreeka tähega (lambda).

Lainepikkus on võrdne laine levimiskiiruse ja laine sageduse jagatisega:

Helilainete puhul on levimiskiiruseks helikiirus (õhus umbes ). Elektromagnetlaine levib vaakumis valguse kiirusega

Näiteks mikrolaineahjus kasutatakse mikrolaineid sagedusega 2,455 GHz, seega lainepikkus

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