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 ---------

λ2=L2-L1λ=2L2-L1
The third resonance will be obtained at a length of
L3=54λ=54×2×L2-L1=52L2-L1

 

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