Final answer:
Chaz's voice, as a baritone, has a lower frequency compared to Stephen's tenor voice, resulting in a lower pitch and longer wavelength.
Step-by-step explanation:
Chaz and Stephen are opera singers with differing voice pitches due to the frequency of their voice's sound waves. Chaz, being a baritone, produces sound waves that are lower in frequency than the ones produced by Stephen, who is a tenor.
In terms of acoustics, a lower frequency corresponds to a lower pitch, which means the sound waves corresponding to Chaz's voice have a longer wavelength and lower pitch compared to the higher frequency and shorter wavelength of Stephen's voice. This concept is similar to how musical instruments work, where high-pitch instruments are generally smaller and produce sound waves with a smaller wavelength, while low-pitch instruments are larger with longer wavelengths.