A sound wave is a longitudinal wave in which the wave oscillates along the direction of propagation. For a traveling wave of speed v, frequency f, and wavelength λ, the following relationship holds.

                                                                                                        v = fλ 

In this experiment, we are going to use a simple characteristic of the traveling wave - the resonance - to determine the wavelength (and therefore the speed) of a sound wave. Me and one of my colleague work on the sound pipe project during a semester. We tried to build a device which makes possible for students to calculate the speed of sound. For this goal, we used a glass tube and a voltage to frequency converter device to produce wave sound. These sound waves travel across the tube and are reflected upon reaching the coin shape blocks, which we prepared at the end of the tube. Also, we could change the position of this block and adjust it to the accurate location.  The incoming and reflected waves interfere and form standing waves. 

As a result, the resonance conditions satisfied and we will be able to calculate the sound speed.