# Calculate the Ratio of Lengths of Their Air Columns - Physics

The fundamental frequency of an air column in a pipe closed at one end is in unison with the third overtone of an open pipe. Calculate the ratio of lengths of their air columns

#### Solution

Given that n3 = no
where n3 = frequency of the third overtone of the open pipe
no = fundamental frequency of the closed pipe

Third overtone of open pipe is

n_3=4(V/(2L_3))

Fundamental frequency of closed pipe at one end is

n_o=V/(4L_o)

V/(4L_o)=4(V/(2L_3)) ..........(∵ no=n3)

thereforeL_o/L_3=1/8

therefore L_0:L_3=1:8

Concept: Study of Vibrations of Air Columns
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