An organ pipe P1, closed at one end vibrating in its first harmonic, and another pipe P2 open at both ends vibrating in its third harmonic are in resonance with a given tuning fork. The ratio of the length of P1 to that of P2 is:

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An organ pipe P1, closed at one end vibrating in its first harmonic, and another pipe P2 open at both ends vibrating in its third harmonic are in resonance with a given tuning fork. The ratio of the length of P1 to that of P2 is: