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The third resonant length of a closed air column is 75cm . What is the first and second length

  • physics - ,

    L= 5•λ/4,
    λ =4•L/5 = 4•75/5= 60,
    L1 = λ/4 =60/4=15 cm,
    L2=3•λ/4=45 cm.

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