What Determines the Speed of Sound in an Organ Pipe?

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The discussion centers on determining the speed of sound in an organ pipe that is 2.5 m long and closed at one end. Participants explore the average speed of air molecules at a displacement antinode, concluding that it is zero due to maximum displacement, while also noting that the average speed of air molecules in still air is around 500 m/s. The wave speed for a sound wave in an infinitely long pipe is discussed, with calculations involving wavelength and frequency leading to a wave speed of 900 m/s. The lowest possible frequency of a stationary wave in the pipe is calculated to be 90 Hz, consistent across different methods. The conversation highlights the importance of distinguishing between speed and velocity in the context of sound waves.
  • #31
True! Thank you!
 
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  • #32
If you don't mind, can I just ask you one more thing please? What experimental evidence is there that sound travels in air as a progressive, longitudinal wave? I'm not sure which one fits proper experimental evidence.

You know what the funny thing is, for part iii where it was asking for the lowest possible frequency, I get the same answer with both methods: fn=n f1 and the way we did it. 90 Hz for both.
 
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