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At concerts, the audience in balcony, wh...

At concerts, the audience in balcony, while jumping up and down in tune with the music may cause damage to balcony, sometimes. Why?

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When audience sitting in balcony jump up and down in tune with the music, sometimes, the jumping frequency may match the natural vibration frequency of the balcony. Due to it, resonance takes place. The balcony starts vibrating with large amplitude and might be damaged.
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