3.In a resonance air column experiment,first and second resonances are obtained at lengths of air columns L1 and L2, the third resonance will be obtained at a length of --------- Share with your friends Share 0 Pratyay Ghosh answered this λ2=L2-L1⇒λ=2L2-L1 The third resonance will be obtained at a length of L3=54λ=54×2×L2-L1=52L2-L1 -3 View Full Answer