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The answer would be d 900Hz, because it is 900 is not 200 does not go into 900 evenly. The pipe will resonate a frequencies that 200 will go into evenly.

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Q: The lowest tone to resonate in an open pipe of length L is 200 Hz what frequencies will not resonate in the same pipe a 400Hz b 600Hz c 800Hz d 900Hz?
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