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What is the fundamental frequency of an open organ pipe of length 42.5 cm, if the velocity of sound in air is 340 m/s?

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400 Hz
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The first overtone frequency of a closed organ pipe P_1 is equal to the fundamental frequency of an open organ pipe P_2 . If the length of the pipe P_1 is 30 cm, what will be the length of P_2 ?

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