Final answer:
The example of an opera singer shattering a glass involves resonance, which occurs when the singer's voice matches the glass's natural frequency, causing it to vibrate and eventually shatter.
Step-by-step explanation:
An opera singer shattering a crystal glass with her voice is an example of resonance. This phenomenon occurs when the singer hits a note that matches the natural frequency of the glass. As the sound wave is directed at the glass, the glass begins to resonate at the same frequency as the sound wave. When the glass is exposed to this frequency at a high enough intensity, the energy causes the glass to vibrate strongly, and it can eventually shatter. This illustrates the power of resonance and how matching the natural frequency of an object with sound can lead to dramatic effects.