5. a high soprano singer can break a crystal ...
5. a high soprano singer can break a crystal glass if the glass resonates with her voice. in order to do this, the sound the singer makes has to be — (2005 - 25) a. speeded up before reaching the glass b. amplified before reaching the glass c. reflected off the glass d. able to vibrate the glass
Answer
# Brief Explanations:
Resonance occurs when an external force (in this case, the singer's sound) matches the natural frequency of an object (the glass). When this happens, the object vibrates with large - amplitude. For a glass to break due to sound, the sound must be able to make the glass vibrate at its resonant frequency. Speeding up sound doesn't cause breakage, amplification alone isn't the key factor, and reflection off the glass isn't what causes breakage.
# Answer:
d. able to vibrate the glass