Physics

Problem

Which of the following expressions gives the frequency of the

n

th harmonic (

n = 1,2,3,\dots

) in an air column that is closed at one end and open at the other, where

v

is the speed of sound and

L

is the length of the tube? a)

f_n = \dfrac{(2n+1)v}{4L}

f_n = \dfrac{nv}{2L}

f_n = \dfrac{(2n-1)v}{4L}

f_n = \dfrac{(2n-1)v}{2L}