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Questions for Discussion: Glass Breaking with Sound

What are oscillation, resonance, and amplitude?
Try tapping some objects. Can you identify their natural frequencies?
How can a solid object shatter from vibrating?
Can you think of other examples of objects breaking in a similar way?
Have you ever sung into a piano and heard the piano repeat that note back to you? Do you think if you could sing loudly enough, you could break the strings on a piano?