A train passes through a tunnel that is 250 m long. What is the fundamental frequency of the vibrating air in the tunnel?

1 Answer
Jan 7, 2018

The fundamental frequency is #=0.68Hz#

Explanation:

The speed of sound in air is #v=340ms^-1 " at " 20^@C#

The wavelength is #lamba=2xx "length of tunnel"#

#"Length of the tunnel " =250m#

#lambda=2*250=500m#

The frequency is

#f=v/lambda=340/500=0.68Hz#