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using given 0.54m i calculated L1

also after rearranging L1=λ/2 i got wavelength which is 1.08m

L2 = λ

and since the distance between all the resonant lengths is always the same, i just added 0.54 to length 2 to figure out length 3

which is L3=1.62m

my question is i cant seem to be able to find a formula for open ended column resonant frequencies for resonant length 3

should i just use the universal wave equation? v=fλ

and re arrange and use f=v/λ

or is there a different equation for finding frequency of 3rd resonant length in open air columns?

how do i find the frequency for third resonant length?

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# Third resonance length frequency(which formula do i use?)

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