Tanner is running his finger around the top of a crystal glass with a natural frequency of 1100 hertz. If Tanner can cause the glass to resonate, it could create a high-pitched sound and shatter.

Resonance occurs when an object is driven at its natural frequency. Tanner’s glass has a natural frequency of 1100 hertz, so vibrating it at 1100 hertz can make its vibrations grow and potentially shatter it. Vibrating it at 550 hertz does not match the glass’s natural frequency.

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