Answer to Question #175783 in Physics for Sky

Question

The frequency of the 2nd harmonic of an organ pipe (closed at one end) is 175 Hz. If that pipe is 1.50m long, what is the speed of sound in air ?

Answer 1

In a pipe open at one end the frequency of the second harmonic is 175 Hz, and 3/4 of a wavelength is in the pipe, so, the speed of sound in air is

$$c=\lambda f_0=\frac 43L f=\frac43 1.5·175=350\text{ m/s}.$$