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When a vibration of a particular frequency takes place, a nearby object may start to vibrate in sympathy.
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When a vibration of a particular frequency takes place, a nearby object may start to vibrate in sympathy. The vibrations then combine to produce a large vibration. This is called resonance. Resonance is an effect caused by a vibrating body setting another body vibrating, both having the same natural frequency. If set into vibration and left to vibrate by itself a body will vibrate with its own natural frequency. On the other and it can be made to vibrate at any frequency by an imposed external frequency. When the imposed frequency is the same as the natural frequency,...
the first position: l1 + c = l where c is the end correction which arises

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from the fact that the antinode at the top does not exactly coincide with the top of the tube. For the second position: l2 + c = 3l eliminating c from both equations, we

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have: l2 ?óÔé¼ÔÇ£ l1 = l/2

l = 2l2 ?óÔé¼ÔÇ£ l1

v = f l = 2fl2 ?óÔé¼ÔÇ£ l1

the velocity v can then be calculated, note that two lengths l1 and l2 are obtained instead of just one.

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