Which are examples of resonance? Choose three correct answers.

Resonance occurs when an object is driven by a vibration at or near its natural frequency, causing a larger vibration. A saxophone’s air column resonates to produce and strengthen musical notes, and pushing a swing at its natural rate makes it swing higher. An opera singer can also make a glass vibrate strongly at its resonant frequency until it breaks. An echo is reflected sound, while turning up a stereo simply increases its output volume.

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