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Refer to diagram 1. Assume the speed of sound in air is 337 m/s. This question again refers to a Quncke tube (as in question 2). Suppose the length of the longer tube is at the minimum length so there is total destructive interference when the frequency of the note played by the speaker at frequency f = 20 Hz. Now, the frequency of the sound increases at a steady rate: df = 1.76 Hz/s. If the shorter dt tube remains at constant length, at what rate must the longer tube have to change in length, in cm/s, so you continuously have total destructive interference whenf = 690 Hz? (The sign will tell if it is increasing or decreasing.)
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Transcribed Image Text:Refer to diagram 1. Assume the speed of sound in air is 337 m/s. This question again refers to a Quncke tube (as in question 2). Suppose the length of the longer tube is at the minimum length so there is total destructive interference when the frequency of the note played by the speaker at frequency f = 20 Hz. Now, the frequency of the sound increases at a steady rate: df = 1.76 Hz/s. If the shorter dt tube remains at constant length, at what rate must the longer tube have to change in length, in cm/s, so you continuously have total destructive interference whenf = 690 Hz? (The sign will tell if it is increasing or decreasing.)
Diagram 1 A Right: A Quincke tube. A speaker produces sound at T, it splits into two parts- one part travels upward (through A) and the other travels downward (through B). The two parts recombine, and come out at O where you are listening. B
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Transcribed Image Text:Diagram 1 A Right: A Quincke tube. A speaker produces sound at T, it splits into two parts- one part travels upward (through A) and the other travels downward (through B). The two parts recombine, and come out at O where you are listening. B
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