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Waves are disturbances that propagate through space and time. Classically, they travelled through a medium, disturbing the particles but not changing their mean position. Electromagnetic waves/particle-waves need no medium; they are disturbances in their respective fields.

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Note produced by an open organ pipe and a closed organ pipe

When an air column in a flute (or organ pipe) is made to vibrate, it vibrates with its natural frequency which is inversely proportional to the length of air column (i.e., $f\propto 1/l$). In a flute …
Decepti Brine's user avatar