Open End

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Frequently Asked Questions...

Why does the wave reflects at the open end of an organ pipe?

When we blow air into an open organ pipe , longitudinal wave is set up. It gets reflected at the other open end . WHY?

Best Answer...


In an open pipe, when a compressed wave reaches the far end, the air at that point is, for an instant, at a pressure greater than the atmospheric pressure. Being an open end, the air there can vibrate with maximum freedom and so, it suddenly expands into the surrounding air. Thus, the pressure diminishes so quickly that it becomes lesser than the pressure of the surrounding air, which causes a sudden rarefaction at the end of the pipe. This sets up a rarefied wave which passes back along the pipe. Within the tube, the reflected pulses meet the direct ones and the result is the formation of the standing wave