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The first resonant length of a closed air column occurs when the length is 30.0cm . What will the second and third resonant lengths be

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    L1 = λ/4,
    λ =4•L =4•30 =120 cm,
    L2 =3 •λ /4 =3•120/4=90 cm,
    L3 = 5•λ /4 =5•120/4=150 cm,

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