When an open organ pipe resonates in its fundamental mode then at the centre of the pipe : (A) T...

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Pipes (1983)
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When an open organ pipe resonates in its fundamental mode then at the centre of the pipe :
(A) The gas molecules undergo vibrations of maximum amplitude
(B) The gas molecules are at rest
(C) The pressure of the gas is constant
(D) The pressure of the gas undergoes maximum variation
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