When we produce a sound with our voice, we can get the vocal…

When we produce a sound with our voice, we can get the vocal folds vibrating (source) with air from our lungs. We can then shape (filter) that source by changing the pathway that the sound makes as it exits our mouth. Suppose we start out with our mouth wide open, and then draw it almost closed like we were blowing through a straw. The sound would likely:

Sound travels in waves, either longitudinally or transverse….

Sound travels in waves, either longitudinally or transverse. In one case the vibratory force is moving “inline” with the resulting wave (longitudinal) and in another case the force is perpendicular to the resulting wave. What did your text say about what type of wave “sound” produces?