
The length of an organ pipe is 19.48
Given,
An organ pipe that is open on both ends and has a fundamental frequency of  n1 = 8.75Hz & the speed of sound in air is v =  341m/s
we have the formula for fundamental frequency in open pipe as
    n1 = v /λ1 = v / 2L
  so  L = v / 2n1
plug in the values for L
n1 = v / λ1 = v / 2L
   L = v / 2n1
   = 341 / 2 (8.75)
  = 19.48
The length of an organ pipe is 19.48
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