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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
Transcribed Image Text:Refer to diagram 1.
Assume the speed of sound in air is 373 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: = 4.79 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 when f = 156
Hz? (The sign will tell if it is increasing or decreasing.)
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