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If λ is the wavelength of sound wave in air column in the first wavelength in the 3rd mode for closed pipe of length l will be 

A) 4l/3

b) 4l/7

c) 4l/5

D) 2l/3

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1 Answer

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Frequency of closed orgen pipe = \(\frac{(2n-1)v}{4}\)

f = \(\frac{(2n-1)v}{4}\)

\(\frac{v}{\lambda}=\frac{(2n-1)v}{4l}\)

\(\frac{4l}{5}=\lambda\)

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