Modes of vibratioin of an air column in an open pipe `:`
(1) For a open pipe both the ends are open. So antinodes will be formed at both the ends. But two antinodes cannot exist without a node between them.
(2) The possible harmonics in vibrating air column of a open pipe is given by `v = ( n v)/( 2l)` Where n =1,2,3, (`1^(st)`harmonic or fundamental frequence )
(3) In first normal Mode of vibrating air column in a open pipe `v_(1) =( v)/( 2l) =v `
(4) In second normal Mode of vibrating air column in a open pipe,`v_(2) = (2v)/(2l)= 2v `
(5) In third, normal Mode of vibrating air column in a open pipe, `v_(3)=( 3v)/(2l) =3v `
(6) In open pipe the ratio of frequencies of harmonics is
`v_(1): v_(2) : v_(3) =v,2v: 3v= 1:2:3`
